Giant exchange anisotropy observed in Mn–Ir∕Co–Fe bilayers containing ordered Mn3Ir phase
Giant exchange anisotropy observed in Mn–Ir∕Co–Fe bilayers containing ordered Mn3Ir phase
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DOI：
10.1063/1.1812597
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发表时间：
2004-10
影响因子：
4
通讯作者：
K. Imakita;M. Tsunoda;M. Takahashi
中科院分区：
文献类型：
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作者：
K. Imakita;M. Tsunoda;M. Takahashi
研究了在50 nm厚的Cu衬底上通过改变Mn-Ir层沉积过程中的衬底温度（Tsub）制备的Mn 73 Ir 27 scinCo 70 Fe 30双层膜的交换各向异性，并与Mn-Ir层的晶体结构相关联.双层膜的单向各向异性常数（JK）显着变化的Tsub的函数。在320 °C、1 kOe的磁场中对双层膜进行热退火后，随着Tsub从室温升高到170 °C，JK从0.3 erg scincm 2急剧增加到1.3erg scincm 2。封闭温度同时从270 °C提高到360 °C。1.3erg scincm ~ 2的JK值比Mn-Ir scinCo-Fe双层膜的研究早期报道的值大近10倍。X射线衍射分析表明，随着Tsub的增加，反铁磁层中形成了有序的Mn 3 Ir相。从JK值的提高与超晶格衍射线峰强度的增加的一致性来看，Mn_3Ir相可能是超晶格结构的起源。
Exchange anisotropy of Mn73Ir27∕Co70Fe30 bilayers fabricated on a 50-nm-thick Cu under layer by changing the substrate temperature (Tsub) during the deposition of Mn–Ir layer was investigated, correlating with the crystallographic structure of Mn–Ir layer. The unidirectional anisotropy constant (JK) of the bilayers remarkably varied as a function of Tsub. After the thermal annealing of bilayers at 320 °C in a magnetic field of 1 kOe, JK steeply increased from 0.3 to 1.3erg∕cm2, as Tsub was raised from room temperature to 170 °C. The blocking temperature was enhanced from 270 to 360 °C, simultaneously. The JK of 1.3erg∕cm2 is nearly ten times larger than the values reported in Mn–Ir∕Co–Fe bilayers early in the research of them. The x-ray diffraction profiles showed that the ordered Mn3Ir phase was formed in the antiferromagnetic layer with increasing Tsub. From the coincidence of enhancing JK and increasing peak intensity of superlattice diffraction lines, the Mn3Ir phase was suggested to be an origin of t...