应力各向异性对铁磁/反铁磁双层薄膜磁性质的影响  

Effect of Stress Anisotropy on Properties of Ferromagnetic and Antiferromagnetic Bilayer Films

作　　者：荣建红[1] 云国宏[1] 

机构地区：[1]内蒙古大学理工学院物理系,内蒙古呼和浩特010021

出　　处：《高压物理学报》2006年第3期265-269,共5页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10147203);教育部新世纪优秀人才支持计划资助项目

摘　　要：采用铁磁共振方法,研究了交换各向异性和应力各向异性对铁磁/反铁磁双层薄膜性质的影响。结果表明:界面交换作用导致单向各向异性,应力各向异性对材料的磁化难易程度有较大影响。在外磁场方向接近应力场方向时,共振频率向高值方向移动,其它区域共振频率则向低值方向移动。对频率线宽而言,接近应力场方向,频率线宽加宽,其它区域频率线宽则变窄。此外,当磁场变化时,应力的存在使得共振频率向低值方向移动,尤其在β=π方向情况较为复杂,在弱场范围出现了两个区域:即在某磁场范围内,共振频率向高值方向移动,且频率线宽加宽;而其它范围的共振频率(线宽)是向高值方向移动(加宽)还是向低值方向移动(变窄),取决于外磁场的相对强弱。The effect of exchange anisotropy and stress anisotropy on properties of a ferromagnetic and antiferromagnetic bilayer films are investigated by ferromagnetic resonance method. It is shown that exchange anisotropy results from the unidirectional anisotropy. And stress anisotropy has large effect on hard or easy magnetization direction. When external magnetic field direction and stress field direction are parallel,the resonance frequency is shifted to higher value,and the frequency linewidth becomes wider. When external magnetic field is varied, the stress anisotropy made resonance frequency shifted to lower value. Especially,it is very complex in direction β=π . For weak magnetic field,there are two regions. In certain magnetic field region,the resonance frequency is shifted to higher value and frequency linewidth becomes widened. However, the resonance frequency（frequency linewidth） is shifted to higher value（is widened） or lower value（is sharpened） depended on the external magnetic field in other region.

关 键 词：铁磁共振 铁磁/反铁磁双层膜 单轴各向异性 交换各向异性 应力各向异性 

分 类 号：O521[理学—高压高温物理] TM27[理学—物理]