Uniaxial to unidirectional transition of perpendicular interlayer coupling in IrMn/CoFe/NiFeO/CoFe quadrilayers
Uniaxial to unidirectional transition of perpendicular interlayer coupling in IrMn/CoFe/NiFeO/CoFe quadrilayers
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DOI：
10.1063/1.2182021
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发表时间：
2006-03
影响因子：
4
通讯作者：
Yu-Jen Wang;C. Lai;Po-Hsiang Huang;Hsiu-Hau Lin;Chih-Ta Shen;S. Yang;T. Chin;T. Hong;H. Lin-H.-L
中科院分区：
文献类型：
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作者：
Yu-Jen Wang;C. Lai;Po-Hsiang Huang;Hsiu-Hau Lin;Chih-Ta Shen;S. Yang;T. Chin;T. Hong;H. Lin-H.-L
我们研究了由 IrMn∕CoFe（底层）/NiFeOx∕CoFe（顶层）组成的四层中的层间耦合。在室温下，在 CoFe 层之间观察到面内垂直层间耦合。在 Tt=55K 附近观察到从单轴到垂直方向单向的各向异性转变。纳米氧化物层NiFeOx在高温（单轴）相中没有显示出可区分的铁磁信号，而在低温（单向）相中出现了强信号。提出了一种可能的双组分场景来解释相变，其中纳米氧化物层可能包含非晶短程反铁磁畴和超顺磁性簇。
We studied the interlayer coupling in the quadrilayer consisting of IrMn∕CoFe (bottom layer)/NiFeOx∕CoFe (top layer). An in-plane perpendicular interlayer coupling is observed between CoFe layers at room temperature. An anisotropy transition from uniaxial to unidirectional in a perpendicular direction is observed around Tt=55K. The nano-oxide layer NiFeOx shows no distinguishable ferromagnetic signal in the high-temperature (uniaxial) phase, while a strong signal appeared in the low-temperature (unidirectional) phase. A possible two-component scenario, in which the nano-oxide layer may contain both amorphous short-range antiferromagnetic domains and superparamagneitc clusters, is proposed to explain the phase transition.