Exchange-bias effect in Fe/Cr(211) double superlattice structures
Exchange-bias effect in Fe/Cr(211) double superlattice structures
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DOI：
10.1103/physrevb.61.9653
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发表时间：
2000-04
影响因子：
3.7
通讯作者：
J. Jiang;G. Felcher;A. Inomata;R. Goyette;C. Nelson;S. Bader
中科院分区：
文献类型：
--
作者：
J. Jiang;G. Felcher;A. Inomata;R. Goyette;C. Nelson;S. Bader
在“双超晶格”结构中证明了铁磁体(F)和反铁磁体（AF）之间交换偏置效应的位移磁滞回线特征。利用已建立的Fe/Cr中振荡层间交换耦合，我们构建了$[\ mathm {F}\ mathm {e}/\ mathm {C}\ mathm {r}}/\ mathm {r}}/\ mathm {F}}\ mathm {r}/[\ mathm {F}\ mathm {e}/\ mathm {C}\ mathm {r}}}}^{F}$双超晶格，其中具有适当Cr间隔厚度的Fe/Cr超晶格代表F和AF。双超晶格是在单晶MgO（110）衬底上溅射生长的（211）取向外晶薄膜。与由不同AF和F相位组成的传统交换偏置接口相比，AF/F接口是相干的。磁化结果表明，AF/F交换耦合影响反磁畴的成核，交换偏置场的大小由共线自旋结构的经典公式直接给出。用偏振中子反射率证实了共线自旋分布。
Shifted hysteresis loops characteristic of the exchange-bias effect between a ferromagnet (F) and an antiferromagnet (AF) are demonstrated in ``double-superlattice'' structures. Utilizing the well-established oscillatory interlayer exchange coupling in Fe/Cr, we have constructed $[\mathrm{F}\mathrm{e}/\mathrm{C}\mathrm{r}{]}^{\mathrm{AF}}/\mathrm{C}\mathrm{r}/[\mathrm{F}\mathrm{e}/\mathrm{C}\mathrm{r}{]}^{F}$ double superlattices where Fe/Cr superlattices with appropriate Cr-spacer thickness represent the F and the AF. The double superlattices are (211)-oriented epitaxial films sputter grown on single-crystal MgO(110) substrates. The AF/F interface is coherent compared to conventional exchange-bias interfaces consisting of dissimilar AF and F phases. Magnetization results show that AF/F exchange coupling affects the nucleation of reverse magnetic domains, and that the magnitude of the exchange-bias field is given directly by the classic formula for collinear spin structures. The collinear spin distribution is confirmed by polarized neutron reflectivity.