分子束外延生长Fe/Fe_(50)Mn_(50)双层膜的交换偏置

EXCHANGE BIASING IN MOLECULAR-BEAM-EPITAXY-GROWN Fe/Fe_(50)Mn_(50) BILAYERS

利用表面磁光克尔效应和铁磁共振对分子束外延生长的Fe/Fe50 Mn50 双层膜的交换偏置场和矫顽力进行了研究 ,实验结果表明 ,当反铁磁层厚度小于 5 5nm时 ,不出现交换偏置 ,而当大于这一厚度时 ,出现交换偏置 ;大约在7nm时 ,达到极大值 .随着反铁磁层厚度的继续增大 ,偏置场和矫顽力随Fe50 Mn50 膜厚的增大而下降 .铁磁共振实验结果表明样品的磁性存在单向各向异性 .并对上述结果进行了讨论 .

Exchange biasing and coercive field of molecular\|beam\|epitaxy\|grown Fe/Fe\-\{50\}Mn\-\{50\} bilayers have been investigated by Surface Magneto\|optical Kerr Effect(SMOKE) and ferromagnetic resonance measurements. The results indicate that there is no exchange biasing when the thickness of antiferromagnetic layer is less than 5 5?nm. The exchange biasing appears when the thickness of antiferromagnetic layer is greater than 5 5?nm,and the maximum value is reached when the thickness is about 7?nm. Exchange biasing and coercive field decrease with further increase of the thickness of the antiferr\|magnetic layer. The ferromagnetic resonance measurement results show that there exists unidirectional anisotropy. The above results are discussed in the paper.