Exchange Bias Characteristics in Specular Spin Valve System With Embedded (Co–Fe)/Cr Nano-Oxide-Layer in Pinned Ferromagnetic Layer
Exchange Bias Characteristics in Specular Spin Valve System With Embedded (Co–Fe)/Cr Nano-Oxide-Layer in Pinned Ferromagnetic Layer
复制标题
钉扎铁磁层中嵌入 (Co-Fe)/Cr 纳米氧化物层的镜面自旋阀系统的交换偏置特性
DOI：
10.1109/tmag.2007.894012
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发表时间：
2007
影响因子：
2.1
通讯作者：
N. Hasegawa
中科院分区：
文献类型：
--
作者：
M. Sahashi;K. Sawada;H. Endo;M. Doi;N. Hasegawa
在自旋阀系统中插入纳米氧化层（NOL）可以有效地提高电流面内（CIP）和电流垂直面（CPP）结构下的磁电阻比。最近，利用磁场冷却方法，从室温（R. T.）在Co0.9Fe0.1 pin-NOL中，存在NaCl型CoO-FeO反铁磁组分。本文研究了（Co-Fe）/Cr pin-NOL镜面自旋阀系统中的NOL钉扎辅助效应。氧化前在Co-Fe层上沉积一层超薄的Cr层存款，在低于室温的低温范围内，随着（Co-Fe）-NOL偏置阻断温度（TB）的升高，交换偏置场进一步增大。并充分利用金属反铁磁体（Ir-Mn）在室温下的上级钉扎特性。在富钴地区。从氧化物的复杂形成及其磁性的角度考虑了超薄Cr层对NOL交换偏置的影响。
The insertion of a nano-oxide-layer (NOL) into a spin valve system is well known to be very effective in enhancing the magnetoresistance ratio at both of current-in-plane (CIP) and current-perpendicular-to-plane (CPP) geometries. Recently, a clear NOL pinning assist effect is reported to be observed in the low temperature range below ~150 K by using the magnetic field cooling method from room temperature (R.T.) in the Co0.9Fe0.1 pin-NOL, wherein the NaCl-type CoO-FeO antiferromagnetic component exists. In this paper, the NOL pinning assist effect in a specular spin valve system with (Co-Fe)/Cr pin-NOL is presented. An ultra-thin Cr layer deposit on the Co-Fe layer before oxidation leads to increase the exchange bias field still more with the increment of the blocking temperature (TB)of the (Co-Fe)-NOL biasing in the low temperature range below R.T. and to fully exploit the superior pinning properties of the metallic antiferromagnet (Ir-Mn) at R.T. in the Co-rich region. The effect of ultra-thin Cr layer on the NOL exchange bias is considered from the aspect of the complicated oxide formation and its magnetism.