Spin-transfer magnetization switching in ordered alloy-based nanopillar devices
Spin-transfer magnetization switching in ordered alloy-based nanopillar devices
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DOI：
10.1088/0022-3727/44/38/384003
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发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
S. Mitani
中科院分区：
文献类型：
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作者：
S. Mitani
综述了有序合金纳米柱器件中自旋转移磁化开关的研究进展。l10 -有序FePt被用于垂直磁化系统中自旋转移开关的最早演示之一。磁化开关的行为偏离了基于宏观自旋模型的预测，表明在具有较大垂直磁各向异性的系统中存在非相干磁化开关。用l10 -有序FePt测试了90°自旋注入器对自旋转移开关的影响。Full-Heusler合金是另一种令人着迷的自旋转移开关材料，因为它们具有传导电子的高自旋极化和可能的小磁化阻尼。基于b2有序co2feal0.5 si0.5的器件显示出低的自旋转移开关的固有临界电流密度为9.3 × 106 A cm−2，以及相对较大的电流-垂直于平面的巨大磁阻（pcp - gmr）高达~ 9%。有序合金的特殊物理性质可用于自旋转移开关的基础研究和应用。
This paper reviews spin-transfer magnetization switching in ordered alloy-based nanopillar devices. L10-ordered FePt was used for one of the earliest demonstrations of spin-transfer switching in perpendicularly magnetized systems. The behaviour of magnetization switching deviates from the predictions based on a macro-spin model, suggesting incoherent magnetization switching in the system with a large perpendicular magnetic anisotropy. The effect of a 90° spin injector on spin-transfer switching was also examined using L10-ordered FePt. Full-Heusler alloys are in another fascinating material class for spin-transfer switching because of their high-spin polarization of conduction electrons and possible small magnetization damping. A B2-ordered Co2FeAl0.5Si0.5-based device showed a low intrinsic critical current density of 9.3 × 106 A cm−2 for spin-transfer switching as well as a relatively large current-perpendicular-to-plane giant-magnetoresistance (CPP-GMR) up to ∼9%. The specific physical properties of ordered alloys may be useful for fundamental studies and applications in spin-transfer switching.