A direct measurement of rotatable and frozen CoO spins in exchange biassystem of CoO/Fe/Ag(001)
A direct measurement of rotatable and frozen CoO spins in exchange biassystem of CoO/Fe/Ag(001)
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发表时间：
2010-07
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通讯作者：
J. Wu;J. Park;W. Kim;E. Arenholz;M. Liberati;A. Scholl;Y. Wu;C. Hwang;Z. Qiu
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作者：
J. Wu;J. Park;W. Kim;E. Arenholz;M. Liberati;A. Scholl;Y. Wu;C. Hwang;Z. Qiu
在CoO/Fe/Ag（001）交换偏置系统中直接测量可旋转和冻结的CoO自旋。公园，1 W。Kim 1、2、E. Arenholz，3 M。利伯拉蒂，3A。Scholl，3 Y. Z. Wu，4 Chanyong Hwang 2，和Z. Q. Qiu 1美国加州大学伯克利分校物理系，地址：伯克利，加州94720，美国韩国标准与科学研究院，韩国大田市有城305-340，韩国94720，美国复旦大学物理系，上海，中国。利用X射线磁圆二色性（XMCD）和X射线磁线二色性（XMLD）技术研究了外延生长的CoO/Fe/Ag（001）薄膜的交换偏置.在Fe磁化反转过程中对CoO层的直接XMLD测量表明，CoO补偿自旋在较薄的厚度下是可旋转的，并且在较大的厚度下是冻结的。通过定量测定的可旋转和冻结的CoO自旋作为CoO膜厚度的函数，我们发现显着的结果，即交换偏置以及建立之前冻结自旋可检测到的CoO膜。我们进一步表明，可旋转和冻结的CoO自旋均匀分布在CoO膜。PACS编号：75.70.Ak
A direct measurement of rotatable and frozen CoO spins in exchange bias system of CoO/Fe/Ag(001) J. Wu 1 , J. S. Park, 1 W. Kim 1, 2 , E. Arenholz, 3 M. Liberati, 3 A. Scholl, 3 Y. Z. Wu, 4 Chanyong Hwang 2 , and Z. Q. Qiu 1 Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA Korea Research Institute of Standards and Science,Yuseong, Daejeon 305-340, Koera 94720, USA Dept. of Physics, Fudan University, Shanghai, P. R. China Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California Abstract The exchange bias of epitaxially grown CoO/Fe/Ag(001) was investigated using X- ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) techniques. A direct XMLD measurement on the CoO layer during the Fe magnetization reversal shows that the CoO compensated spins are rotatable at thinner thickness and frozen at larger thickness. By a quantitative determination of the rotatable and frozen CoO spins as a function of the CoO film thickness, we find the remarkable result that the exchange bias is well established before frozen spins are detectable in the CoO film. We further show that the rotatable and frozen CoO spins are uniformly distributed in the CoO film. PACS numbers: 75.70.Ak