Leutenantsmeyer, J. C. and Walter, M. and Zbarsky, V. and Muezenberg, M. and Gareev, R. and Rott, K. and Thomas, A. and Reiss, G. and Peretzki, P. and Schuhmann, H. and Seibt, M. and Czerner, M. and Heiliger, C. (2013) PARAMETER SPACE FOR THERMAL SPIN-TRANSFER TORQUE. SPIN, 3 (1): 1350002. ISSN 2010-3247, 2010-3255
Full text not available from this repository. (Request a copy)Abstract
Thermal spin-transfer torque describes the manipulation of the magnetization by the application of a heat flow. The effect has been calculated theoretically by Jia et al. in 2011. It is found to require large temperature gradients in the order of Kelvins across an ultra thin MgO barrier. In this paper, we present results on the fabrication and the characterization of magnetic tunnel junctions with three monolayer thin MgO barriers. The quality of the interfaces at different growth conditions is studied quantitatively via high-resolution transmission electron microscopy imaging. We demonstrate tunneling magnetoresistance ratios of up to 55% to 64% for 3 to 4 monolayer barrier thickness. Magnetic tunnel junctions with perpendicular magnetization anisotropy show spin-transfer torque switching with a critical current of 0.2 MA/cm(2). The thermally generated torque is calculated ab initio using the Korringa-Kohn-Rostoker and nonequilibrium Green's function method. Temperature gradients generated from femtosecond laser pulses were simulated using COMSOL, revealing gradients of 20K enabling thermal spin-transfer-torque switching.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; Magnetic tunnel junctions; thermal spin-transfer torque; ultra thin MgO barrier |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Günther Bayreuther Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Apr 2020 07:11 |
| Last Modified: | 24 Apr 2020 07:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17120 |
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