Jeong Jong Seok, Akase Zentaro, Shindo Daisuke, Zhan Qing-Feng, Krishnan Kannan M
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.
J Electron Microsc (Tokyo). 2011;60(3):235-42. doi: 10.1093/jmicro/dfr015. Epub 2011 Apr 7.
We investigated magnetic remanence states of epitaxially grown, exchange-biased MnPd/Fe bilayers by electron holography emphasizing the crystallographic orientations of the layers. Thin-foil transmission electron microscopy (TEM) specimens were carefully prepared along both hard and easy axes of the Fe layer. The ex situ magnetization-reversal process was carried out using the TEM specimens, and magnetic flux densities of the ultra-thin Fe layers were evaluated at different remanence states. We show that a spin configuration in the TEM specimens is determined by the competition between an exchange coupling at the MnPd/Fe bilayer interface, shape anisotropy of TEM specimens and intrinsic magnetocrystalline anisotropy of Fe.
我们通过电子全息术研究了外延生长的、具有交换偏置的MnPd/Fe双层膜的剩磁状态，重点关注各层的晶体取向。沿着Fe层的硬轴和易轴仔细制备了薄箔透射电子显微镜（TEM）样品。使用TEM样品进行了非原位磁化反转过程，并在不同剩磁状态下评估了超薄Fe层的磁通密度。我们表明，TEM样品中的自旋构型由MnPd/Fe双层界面处的交换耦合、TEM样品的形状各向异性以及Fe的固有磁晶各向异性之间的竞争决定。
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