摘要
采用直流磁控溅射的方法在氧化镁(100)单晶基板上生长了一系列c轴垂直取向的FePt薄膜,通过改变沉积时的基板温度,薄膜从Fe,Pt原子无序排列的面心立方结构逐渐变化到有序排列的L10相面心四方结构.在此基础上,系统研究了FePt薄膜的化学有序度对磁和磁光性能的影响.随着有序度的增加,FePt薄膜的磁晶各向异性能,以及沿垂直方向的矫顽力、剩磁比均增加,在基板温度高于530℃时制备的薄膜中的磁晶各向异性能超过1J/cm3.同时,还观察到有序FePt合金薄膜的磁光克尔光谱(克尔转角的大小和极值所对应的跃迁光子能量)随化学有序度的显著变化.
A series of FePt thin films with perpendicular c-axis orientation were deposited on single crystal MgO （001） substrates by DC magnetron sputtering. With the increase of substrate temperature during deposition, FCC disordered structure transforms to FCT ordered structure （L1o phase） gradually, and the chemical ordering parameter increases simultaneously. Furthermore, the magneto-crystalline anlsotropy, coercivity and squareness ratio of the hysteresis loops along perpendicular direction increase also. The magneto-optical Kerr spectra were found to be changing notablely with the chemical ordering of FePt films.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期1719-1724,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60490290
10374019)
上海市科委浦江计划(批准号05PJ14016)资助的课题.~~
