TY - JOUR AU - Sánta, Botond AU - Balogh, Zoltán AU - Gubicza, Ágnes AU - Pósa, László AU - Krisztián, Dávid AU - Mihály, György AU - Csontos, Miklós AU - Halbritter, András Ernő TI - Universal 1/f type current noise of Ag filaments in redox-based memristive nanojunctions JF - NANOSCALE J2 - NANOSCALE VL - 11 PY - 2019 IS - 11 SP - 4719 EP - 4725 PG - 7 SN - 2040-3364 DO - 10.1039/c8nr09985e UR - https://m2.mtmt.hu/api/publication/30538957 ID - 30538957 LA - English DB - MTMT ER - TY - JOUR AU - Gubicza, Ágnes AU - Geresdi, Attila AU - Csontos, Miklós AU - Halbritter, András Ernő AU - Mihály, György TI - A mesterséges intelligencia építőeleme - az Ag2S memrisztor JF - FIZIKAI SZEMLE J2 - FIZIKAI SZEMLE VL - 67 PY - 2017 IS - 9 SP - 302 EP - 307 PG - 6 SN - 0015-3257 UR - https://m2.mtmt.hu/api/publication/3275628 ID - 3275628 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Mihály, György AU - Kertész, János AU - Zaránd, Gergely Attila TI - Zawadowski Alfréd, 1936–2017 JF - FIZIKAI SZEMLE J2 - FIZIKAI SZEMLE VL - 67 PY - 2017 IS - 10 SP - 363 EP - 365 PG - 3 SN - 0015-3257 UR - https://m2.mtmt.hu/api/publication/3281659 ID - 3281659 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Gubicza, Ágnes AU - D, Zs Manrique AU - Pósa, László AU - C J, Lambert AU - Mihály, György AU - Csontos, Miklós AU - Halbritter, András Ernő TI - Asymmetry-induced resistive switching in Ag-Ag2S-Ag memristors enabling a simplified atomic-scale memory design JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 6 PY - 2016 PG - 9 SN - 2045-2322 DO - 10.1038/srep30775 UR - https://m2.mtmt.hu/api/publication/3101290 ID - 3101290 N1 - Department of Physics, Budapest University of Technology and Economics, Budafokiut 8, Budapest, 1111, Hungary MTA-BME Condensed Matter Research Group, Budafoki ut 8, Budapest, 1111, Hungary Physics Department, Lancaster University, Lancaster, United Kingdom Cited By :11 Export Date: 3 February 2020 Correspondence Address: Csontos, M.; Department of Physics, Budapest University of Technology and Economics, Budafokiut 8, Hungary; email: csontos@dept.phy.bme.hu Department of Physics, Budapest University of Technology and Economics, Budafokiut 8, Budapest, 1111, Hungary MTA-BME Condensed Matter Research Group, Budafoki ut 8, Budapest, 1111, Hungary Physics Department, Lancaster University, Lancaster, United Kingdom Cited By :14 Export Date: 8 February 2021 Correspondence Address: Csontos, M.; Department of Physics, Budafokiut 8, Hungary; email: csontos@dept.phy.bme.hu Funding details: Engineering and Physical Sciences Research Council, EPSRC, EP/K001507/1, EP/J014753/1, EP/H035818/1 Funding details: 293797, 606728 Funding details: K112918, K105735 Funding text 1: This work was supported by the Hungarian Research Funds OTKA K105735, K112918, the EC FP7 "CoSpinNano" (project No. 293797) and ITN "MOLESCO" (project No. 606728) and by the UK EPSRC grants EP/K001507/1, EP/J014753/1 and EP/H035818/1. Funding Agency and Grant Number: Hungarian Research FundsOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [OTKA K105735, K112918]; EC FP7 "CoSpinNano" [293797]; EC ITN "MOLESCO" [606728]; UK EPSRCEngineering & Physical Sciences Research Council (EPSRC) [EP/K001507/1, EP/J014753/1, EP/H035818/1]; Engineering and Physical Sciences Research CouncilEngineering & Physical Sciences Research Council (EPSRC) [EP/K001507/1, EP/H035818/1, EP/J014753/1] Funding Source: researchfish Funding text: This work was supported by the Hungarian Research Funds OTKA K105735, K112918, the EC FP7 "CoSpinNano" (project No. 293797) and ITN "MOLESCO" (project No. 606728) and by the UK EPSRC grants EP/K001507/1, EP/J014753/1 and EP/H035818/1. Useful discussions with Z. Balogh, B. Fulop and M. Calame are acknowledged. The experimental data is held by the Department of Physics, Budapest University of Technology and Economics. The underlying data for the theory analysis is available in the Supplementary Information. Department of Physics, Budapest University of Technology and Economics, Budafokiut 8, Budapest, 1111, Hungary MTA-BME Condensed Matter Research Group, Budafoki ut 8, Budapest, 1111, Hungary Physics Department, Lancaster University, Lancaster, United Kingdom Cited By :15 Export Date: 17 May 2021 Correspondence Address: Csontos, M.; Department of Physics, Budafokiut 8, Hungary; email: csontos@dept.phy.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Halbritter, András Ernő AU - Geresdi, Attila AU - Mihály, György TI - Spin polarized transport as measured by superconducting Andreev spectroscopy JF - FRONTIERS IN NANOSCIENCE AND NANOTECHNOLOGY J2 - FRONT NANOSCI NANOTECH VL - 2 PY - 2016 IS - 6 SP - 1 EP - 8 PG - 8 SN - 2397-6527 DO - 10.15761/FNN.1000137 UR - https://m2.mtmt.hu/api/publication/3157701 ID - 3157701 LA - English DB - MTMT ER - TY - JOUR AU - Gubicza, Ágnes AU - Csontos, Miklós AU - Halbritter, András Ernő AU - Mihály, György TI - Resistive switching in metallic Ag2S memristors due to a local overheating induced phase transition JF - NANOSCALE J2 - NANOSCALE VL - 7 PY - 2015 IS - 26 SP - 11248 EP - 11254 PG - 7 SN - 2040-3364 DO - 10.1039/c5nr02536b UR - https://m2.mtmt.hu/api/publication/2911964 ID - 2911964 N1 - Funding Agency and Grant Number: Hungarian Research Funds OTKAOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [K105735, K112918]; European UnionEuropean Union (EU) [293797] Funding text: This work was supported by the Hungarian Research Funds OTKA K105735, K112918 and by the European Union 7th Framework Programme (Grant No. 293797). The technical assistance of A. Magyarkuti is acknowledged. Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8Budapest 1111, Hungary MTA-BME Condensed Matter Research Group, Budafoki ut 8Budapest 1111, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Gubicza, Ágnes AU - Csontos, Miklós AU - Halbritter, András Ernő AU - Mihály, György TI - Non-exponential resistive switching in Ag2S memristors: a key to nanometer-scale non-volatile memory devices JF - NANOSCALE J2 - NANOSCALE VL - 7 PY - 2015 IS - 10 SP - 4394 EP - 4399 PG - 6 SN - 2040-3364 DO - 10.1039/C5NR00399G UR - https://m2.mtmt.hu/api/publication/2851415 ID - 2851415 N1 - Funding Agency and Grant Number: Hungarian Research FundsOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [OTKA K105735, K112918]; European UnionEuropean Commission [293797]; Bolyai Janos Research Scholarship of the HAS Funding text: This work was supported by the Hungarian Research Funds OTKA K105735 and K112918 and by the European Union 7th Framework Programme (grant no. 293797). M.C. is a grantee of the Bolyai Janos Research Scholarship of the HAS. LA - English DB - MTMT ER - TY - JOUR AU - Geresdi, Attila AU - Csontos, Miklós AU - Gubicza, Ágnes AU - Halbritter, András Ernő AU - Mihály, György TI - Fast operation of nanometer-scale metallic memristors: highly transparent conductance channels in Ag2S devices JF - NANOSCALE J2 - NANOSCALE VL - 6 PY - 2014 IS - 5 SP - 2613 EP - 2617 PG - 5 SN - 2040-3364 DO - 10.1039/C3NR05682A UR - https://m2.mtmt.hu/api/publication/2599319 ID - 2599319 N1 - Funding Agency and Grant Number: Bolyai Janos Research Scholarship of the HAS; European UnionEuropean Union (EU) [293797]; [OTKA CNK80991]; [K105735]; [TAMOP 4.2.1.B-09/1-2010-0002] Funding text: Enlightening discussions with Adam Szullo and his circuit designing contribution to the fast pulsing experiments are acknowledged. This work has been supported by the Hungarian research funds OTKA CNK80991, K105735, TAMOP 4.2.1.B-09/1-2010-0002. M. C. is a grantee of the Bolyai Janos Research Scholarship of the HAS and acknowledges financial support of the European Union 7th Framework Programme (Grant no. 293797). AB - The nonlinear transport properties of nanometer-scale junctions formed between an inert metallic tip and an Ag film covered by a thin Ag2S layer are investigated. Suitably prepared samples exhibit memristive behavior with technologically optimal ON and OFF state resistances yielding to resistive switching on the nanosecond time scale. Utilizing point contact Andreev reflection spectroscopy we studied the nature of electron transport in the active volume of the memristive junctions showing that both the ON and OFF states correspond to truly nanometer scale, highly transparent metallic channels. Our results demonstrate the merits of Ag2S nanojunctions as nanometer-scale memory cells which can be switched by nanosecond voltage pulses. LA - English DB - MTMT ER - TY - JOUR AU - Geresdi, Attila AU - Halbritter, András Ernő AU - Tanczikó, Ferenc AU - Mihály, György TI - Direct measurement of the spin diffusion length by Andreev spectroscopy JF - APPLIED PHYSICS LETTERS J2 - APPL PHYS LETT VL - 98 PY - 2011 IS - 21 PG - 10 SN - 0003-6951 DO - 10.1063/1.3593959 UR - https://m2.mtmt.hu/api/publication/1853926 ID - 1853926 N1 - Funding Agency and Grant Number: New Hungary Development Plan [TAMOP-4.2.1/B-09/1/KMR-2010-0002]; Hungarian Research Funds OTKA [72916, 76010]; Bolyai Janos scholarship Funding text: This work was supported by the New Hungary Development Plan under Project No.: TAMOP-4.2.1/B-09/1/KMR-2010-0002 and by the Hungarian Research Funds OTKA under Grant Nos. 72916 and 76010. A. H. is a grantee of the Bolyai Janos scholarship. AB - The application of point contact Andreev spectroscopy for the measurement of the spin diffusion length is demonstrated by studying the spin relaxation in platinum thin films grown on the top of a ferromagnetic cobalt layer. Using this local probe technique, the temperature dependence of the spin diffusion length was determined, and various sources of the spin relaxation in platinum were identified. At low temperatures the spin lifetime is found to be three orders of magnitude larger than the momentum lifetime. The applied method is selectively sensitive to spin-flip processes even in the presence of a huge background of momentum scattering. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3593959] LA - English DB - MTMT ER - TY - JOUR AU - Geresdi, Attila AU - Halbritter, András Ernő AU - Gyenis, A AU - Makk, Péter AU - Mihály, György TI - From stochastic single atomic switch to nanoscale resistive memory device JF - NANOSCALE J2 - NANOSCALE VL - 3 PY - 2011 IS - 4 SP - 1504 EP - 1507 PG - 4 SN - 2040-3364 DO - 10.1039/c0nr00951b UR - https://m2.mtmt.hu/api/publication/1847917 ID - 1847917 AB - We study the switching characteristics of nanoscale junctions created between a tungsten tip and a silver film covered by a thin ionic conductor layer. Atomic-sized junctions show spectacular current induced switching characteristics, but both the magnitude of the switching voltage and the direction of the switching vary randomly for different junctions. In contrast, somewhat larger junctions with diameters of a few nanometres display a well defined, reproducible switching behavior attributed to the formation and destruction of nanoscale channels in the ionic conductor surface layer. Our results define a lower size limit of 3 nm for reliable ionic nano-switches, which is well below the resolution of recent lithographic techniques. LA - English DB - MTMT ER - TY - JOUR AU - Geresdi, Attila AU - Halbritter, András Ernő AU - Szilágyi, Edit AU - Mihály, György TI - Probing of Ag-based Resistive Switching on the Nanoscale JF - MRS SYMPOSIUM PROCEEDINGS J2 - MRS SYMP PROC VL - 1331 PY - 2011 SP - 38 EP - 43 PG - 6 SN - 0272-9172 DO - 10.1557/opl.2011.1474 UR - https://m2.mtmt.hu/api/publication/1829497 ID - 1829497 LA - English DB - MTMT ER - TY - JOUR AU - Demkó, László AU - Kézsmárki, István AU - Csontos, Miklós AU - Bordács, Sándor AU - Mihály, György TI - Improved thermal relaxation method for the simultaneous measurement of the specific heat and thermal conductivity JF - EUROPEAN PHYSICAL JOURNAL B J2 - EUR PHYS J B VL - 74 PY - 2010 IS - 1 SP - 27 EP - 33 PG - 7 SN - 1434-6028 DO - 10.1140/epjb/e2010-00055-0 UR - https://m2.mtmt.hu/api/publication/1456037 ID - 1456037 N1 - Department of Physics, Budapest University of Technology and Economics, Hungarian Academy of Sciences, Budapest 1111, Hungary Solid State Physics Laboratory, ETH Zurich, Zurich 8093, Switzerland Cited By :3 Export Date: 26 September 2019 Correspondence Address: Demkó, L.; Department of Physics, Budapest University of Technology and Economics, Hungarian Academy of Sciences, Budapest 1111, Hungary; email: ldemko@dept.phy.bme.hu Összes idézések száma a WoS-ban: 0 Department of Physics, Budapest University of Technology and Economics, Hungarian Academy of Sciences, Budapest 1111, Hungary Solid State Physics Laboratory, ETH Zurich, Zurich 8093, Switzerland Cited By :3 Export Date: 25 February 2020 Correspondence Address: Demkó, L.; Department of Physics, Budapest University of Technology and Economics, Hungarian Academy of Sciences, Budapest 1111, Hungary; email: ldemko@dept.phy.bme.hu Department of Physics, Budapest University of Technology and Economics, Hungarian Academy of Sciences, Budapest 1111, Hungary Solid State Physics Laboratory, ETH Zurich, Zurich 8093, Switzerland Cited By :3 Export Date: 18 September 2021 Correspondence Address: Demkó, L.; Department of Physics, , Budapest 1111, Hungary; email: ldemko@dept.phy.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Geresdi, Attila AU - Halbritter, András Ernő AU - Mihály, György TI - Transition from coherent mesoscopic single-particle transport to Josephson proximity current JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 82 PY - 2010 IS - 21 PG - 4 SN - 2469-9950 DO - 10.1103/PhysRevB.82.212501 UR - https://m2.mtmt.hu/api/publication/2111173 ID - 2111173 AB - Creating variable size nanojunctions between a thin metallic film and a superconducting tip we study how multiple phase-coherent scatterings enhance the superconducting correlations at the normal side. By increasing the coherent volume of carriers the transmission through the interface is smoothly enhanced as reflected in the zero-bias conductance. As the phase-coherent volume reaches the opposite surface of the thin film a resonator is formed, the conductance of the interface is dramatically enhanced, and finally a proximity induced Josephson supercurrent is established. LA - English DB - MTMT ER - TY - JOUR AU - Bordács, Sándor AU - Varjas, Dániel AU - Kézsmárki, István AU - Mihály, György AU - Baldassarre, L AU - Abouelsayed, A AU - Kuntscher, CA AU - Ohgushi, K AU - Tokura, Y TI - Magnetic-order-induced crystal symmetry lowering in ACr(2)O(4) ferrimagnetic spinels JF - PHYSICAL REVIEW LETTERS J2 - PHYS REV LETT VL - 103 PY - 2009 IS - 7 PG - 4 SN - 0031-9007 DO - 10.1103/PhysRevLett.103.077205 UR - https://m2.mtmt.hu/api/publication/117102 ID - 117102 AB - We demonstrate that the onset of complex spin orders in ACr(2)O(4) spinels with magnetic and Jahn-Teller active A = Fe and Cu ions lowers the lattice symmetry. This is clearly indicated by the emergence of anisotropic lattice dynamics-i.e., by the pronounced phonon splittings-even when experiments probing static distortions fail. The crystal symmetry in the magnetic phase is reduced from tetragonal to orthorhombic for both compounds. The conical spin ordering in FeCr2O4 is also manifested in the hardening of the phonon frequencies. In contrast, the multiferroic CoCr2O4 with no orbital degrees of freedom shows tiny deviations from cubic structure even in its ground state. LA - English DB - MTMT ER - TY - JOUR AU - Demkó, László AU - Kézsmárki, István AU - Mihály, György AU - Takeshita, N AU - Tomioka, Y AU - Tokura, Y TI - Multicritical end-point of the first-order ferromagnetic transition in colossal magnetoresistive manganites JF - PHYSICAL REVIEW LETTERS J2 - PHYS REV LETT VL - 101 PY - 2008 IS - 3 PG - 4 SN - 0031-9007 DO - 10.1103/PhysRevLett.101.037206 UR - https://m2.mtmt.hu/api/publication/117122 ID - 117122 LA - English DB - MTMT ER - TY - JOUR AU - Geresdi, Attila AU - Halbritter, András Ernő AU - Csontos, Miklós AU - Csonka, Szabolcs AU - Mihály, György AU - Wojtowicz, T AU - Liu, X AU - Jankó, B AU - Furdyna, JK TI - Nanoscale spin polarization in the dilute magnetic semiconductor (In,Mn)Sb JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 77 PY - 2008 IS - 23 PG - 4 SN - 2469-9950 DO - 10.1103/PhysRevB.77.233304 UR - https://m2.mtmt.hu/api/publication/117118 ID - 117118 AB - Results of point-contact Andreev-reflection experiments on (In,Mn)Sb are presented and analyzed in terms of current models of charge conversion at a superconductor-ferromagnet interface. We investigate the influence of surface transparency, and study the crossover from ballistic to diffusive transport regime as contact size is varied. Application of a Nb tip to a (In,Mn)Sb sample with Curie temperature T-C of 5.4 K allowed the determination of spin polarization when the ferromagnetic phase-transition temperature is crossed. We find a striking difference between the temperature dependence of the local spin polarization and of the macroscopic magnetization, and demonstrate that nanoscale clusters with magnetization close to the saturated value are present even well above the magnetic phase-transition temperature. LA - English DB - MTMT ER - TY - JOUR AU - Halbritter, András Ernő AU - Makk, Péter AU - Csonka, Szabolcs AU - Mihály, György TI - Huge negative differential conductance in Au-H2 molecular nanojunctions JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 77 PY - 2008 IS - 7 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.77.075402 UR - https://m2.mtmt.hu/api/publication/117117 ID - 117117 AB - Experimental results showing huge negative differential conductance in gold-hydrogen molecular nanojunctions are presented. The results are analyzed in terms of two-level system (TLS) models: It is shown that a simple TLS model cannot produce peaklike structures in the differential conductance curves, whereas an asymmetrically coupled TLS model gives perfect fit to the data. Our analysis implies that the excitation of a bound molecule to a large number of energetically similar loosely bound states is responsible for the peaklike structures. Recent experimental studies showing related features are discussed within the framework of our model. LA - English DB - MTMT ER - TY - JOUR AU - Mihály, György AU - Csontos, Miklós AU - Bordács, Sándor AU - Kézsmárki, István AU - Wojtowicz, T AU - Liu, X AU - Jankó, B AU - Furdyna, JK TI - Anomalous Hall effect in the (In,Mn)Sb dilute magnetic semiconductor JF - PHYSICAL REVIEW LETTERS J2 - PHYS REV LETT VL - 100 PY - 2008 IS - 10 SN - 0031-9007 DO - 10.1103/PhysRevLett.100.107201 UR - https://m2.mtmt.hu/api/publication/117114 ID - 117114 N1 - Department of Physics, Budapest University of Technology and Economics, Hungarian Academy of Sciences, 1111 Budapest, Hungary Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland Department of Physics, University of Notre Dame, Notre Dame, IN 46556, United States Cited By :29 Export Date: 9 June 2021 CODEN: PRLTA Correspondence Address: Mihály, G.; Department of Physics, , 1111 Budapest, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Fazekas, Patrik AU - Penc, Karlo AU - Radnóczi, K AU - Barišić, N AU - Berger, H AU - Forró, L AU - Mitrović, S AU - Gauzzi, A AU - Demkó, László AU - Kézsmárki, István AU - Mihály, György TI - The electronic structure and the phases of BaVS3 JF - JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS J2 - J MAGN MAGN MATER VL - 310 PY - 2007 IS - 2 SP - 928 EP - 934 PG - 7 SN - 0304-8853 DO - 10.1016/j.jmmm.2006.10.145 UR - https://m2.mtmt.hu/api/publication/1078216 ID - 1078216 AB - BaVS3 is a moderately correlated d-electron system with a rich phase diagram. To construct the corresponding minimal electronic model, one has to decide which d-states are occupied, and to which extent. The ARPES experiment presented here shows that the behavior of BaVS3 is governed by the coexistence of wide-band (A(1g)) and narrow-band (twofold degenerate E) d-electrons. We sketch a lattice fermion model which may serve as a minimal model of BaVS3. This serves foremost for the understanding of the metal-insulator in pure BaVS3 and its absence in some related compounds. The nature of the low-temperature magnetic order differs for several systems which may be described in terms of the same electron model. We describe several recent experiments which give information about magnetic order at high pressures. In particular, we discuss field-induced insulator-to-metal transition at slightly subcritical pressures, and an evidence for magnetic order in the high-pressure metallic phase. The phase diagram of Sr-doped BaVS3 is also discussed. The complexity of the phases of BaVS3 arises from the fact that it is simultaneously unstable against several kinds of instabilities. LA - English DB - MTMT ER - TY - JOUR AU - Fazekas, Patrik AU - Barisic, N AU - Kézsmárki, István AU - Demkó, László AU - Berger, H AU - Forró, L AU - Mihály, György TI - Magnetic-field-induced transition in BaVS3 JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 75 PY - 2007 IS - 3 PG - 5 SN - 2469-9950 DO - 10.1103/PhysRevB.75.035128 UR - https://m2.mtmt.hu/api/publication/145118 ID - 145118 LA - English DB - MTMT ER -