Thermally induced fluctuations of spin accumulation in lateral spin-valve structures and impact on noise

被引:2
|
作者
Strelkov, Nikita [1 ]
Vedyaev, Anatoly [1 ]
Ryzhanova, Natalia [1 ]
Dieny, Bernard [1 ]
机构
[1] Univ Grenoble Alpes, IRIG SPINTEC, Grenoble INP, CEA,CNRS, F-38000 Grenoble, France
关键词
spintronics; lateral spin-valves; spin-current; spin-accumulation; giant magnetoresistance; magnetic noise; paramagnetic resonance;
D O I
10.1088/1361-6463/aca3b4
中图分类号
O59 [应用物理学];
学科分类号
摘要
Gradient of spin accumulation in spintronic devices such as lateral spin-valves allows to generate pure spin-current without charge-current. Spin accumulation is an out-of-equilibrium magnetization in which thermal fluctuations can occur. These fluctuations may constitute a source of noise in lateral spin-valve structures. In this study, the thermally induced fluctuations of the vector of spin-accumulation were investigated theoretically in diffusive regime. It is shown that paramagnetic resonance may arise in the spin-current carrying channel due to electron-electron interactions and exchange splitting induced by the spin-accumulation. This leads to an effect that was not previously considered: resonant increase of the magnetic susceptibility of the paramagnetic channel material and an associated decrease in signal-to-noise ratio around the resonance frequency. Frequency dependence of the magnetic susceptibility and signal-to-noise ratio were calculated analytically in the case of a specific T-shaped lateral spin-valve structures. It was shown however that this noise caused by thermally induced fluctuations in spin-accumulation is generally negligible in comparison to other sources of noise present in lateral spin-valves such as Johnson noise or thermal fluctuations of magnetization in the magnetic electrodes.
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页数:7
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