期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 58, 期 8, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2022.3145393
关键词
Magnetoresistance ratio; semiconductor spintronics; spin injection
资金
- JSPS KAKENHI [17H06120, 19H05616, 21K18719, 21H05000]
- JST PRESTO [JPMJPR20BA]
- Iketani Science and Technology Foundation
- Murata Science Foundation
The study investigates the temperature dependence of two-terminal local magnetoresistance effect in Ge-based lateral spin-valve devices with Fe insertion. The significant improvement in local MR signals at low temperatures to room temperature is observed, but the large temperature dependence of the MR ratio remains.
We investigate temperature dependence of two-terminal local magnetoresistance (MR) effect for germanium (Ge)-based lateral spin-valve (LSV) devices with three different ferromagnet (FM)/Ge Schottky tunnel contacts. When we insert a 0.7-nm-thick Fe layer between Co-based Heusler alloy and Ge interfaces in LSV devices, the magnitude of the local MR signals is significantly improved from low temperatures to room temperature. However, the temperature dependence of the MR ratio is still large even for LSV devices with Fe insertion. From the analysis based on the standard theory, the temperature-dependent MR ratio can be interpreted in terms of thermally excited spin waves (T-3/2 law) in FM contacts. The physical origin of the decay of the two-terminal MR ratio in Ge-based LSV devices is the same as that of the four-terminal nonlocal spin signals because small temperature dependence of contact resistance is demonstrated in FM/Ge Schottky tunnel contacts which show almost linear vertical bar J vertical bar-V characteristics and low interface resistance.
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