Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 58, Issue 4, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2021.3120884
Keywords
Scattering; Heating systems; Tunneling; Magnetic tunneling; Three-dimensional displays; Temperature distribution; Resistance heating; Heat contribution; spin scattering; tunneling electron
Funding
- National Key Research Program of China [2017YFA0206200]
- National Natural Science Foundation for Young Scholar of China [51601139]
- International Postdoctoral Exchange Fellowship Program [20190083]
- Natural Science Foundation of Shaanxi Province [2021JM-022]
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This study investigates the heat contribution of magnetic tunnel junctions in parallel and antiparallel states through tunneling spin scattering. The results show a significant temperature increase of 23.2% from parallel to antiparallel, which is even more significant than the heating asymmetry caused by different current directions. Moreover, the study confirms that the enhancement of temperature gradient plays a significant role in the extra thermal spin-transfer torque.
We investigated the heat contribution by tunneling spin scattering of magnetic tunnel junction in parallel (P) and antiparallel (AP) states using finite element simulation. It showed a maximum temperature increase of 23.2% from P to AP, which is even more significant than the heating asymmetry caused by different current directions. A remarkable enhancement of the temperature gradient was confirmed for contributing to the extra thermal spin-transfer torque to the free layer under a specific current direction. Both the contributions of enhanced temperature and temperature gradient should be the possible reasons for the asymmetry of the critical switching current density from P to AP and AP to P. We also extended the research to a double-barrier structure, clarifying its high performance from the aspect of heat generation. Our demonstration may offer efficient tunneling magnon excitation by using the tunneling spin scattering heat.
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