期刊
PHYSICAL REVIEW B
卷 85, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.104413
关键词
-
资金
- NSF-PREM [DMR-0611562, DMR-0958596]
- National Science Council of Taiwan [NSC 99-2112-M-008-020-MY3]
We demonstrate that interfacial disorder in magnetic tunnel junctions (MTJs) has a dramatic effect on the bias behavior of both spin-transfer and field-like spin torques, leading to strong enhancement, sign reversal, and bias asymmetry. The underlying mechanism lies on the impurity-induced resonance energies, which can be selectively controlled with alloying and/or bias. The predictions explain for the first time the experimental results in dirty junctions and have important implications on exploiting further the alloying effect to optimize the current-induced magnetization switching.
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