Nd-Ce-Fe-B纳米复合薄膜的磁性及交换耦合作用

发布时间：2017-12-26 21:35

本文关键词：Nd-Ce-Fe-B纳米复合薄膜的磁性及交换耦合作用　出处：《物理学报》2017年15期 　论文类型：期刊论文

【摘要】：采用磁控溅射技术制备了具有永磁特征的Nd-Ce-Fe-B多层纳米复合薄膜,并对其进行了退火处理.通过改变退火温度,研究其对薄膜磁性能和晶体结构的影响.结果表明,随着退火温度的提高薄膜磁性能逐渐增大,但当温度达到695℃以上时,薄膜的磁性能急剧下降.当退火温度为675℃时,薄膜的矫顽力Hci=10.1 kOe(1Oe=79.5775 A/m),垂直于薄膜表面方向的剩余磁化强度4πM_(r⊥)=5.91 kG(1 G=10~3/(4π)A/m).薄膜的X射线衍射结果表明,磁性薄膜具有较好的c轴取向.通过对薄膜磁化反转过程的研究,发现随着外加磁场的增大,M_(rev)的极小值向M_(irr)减小的方向移动,这与畴壁弯曲模型类似,表明在薄膜中存在较强烈的局部钉扎作用,而剩余磁化强度曲线表明这种钉扎作用在薄膜矫顽力机制中并不占支配作用.此外,薄膜的Henkel曲线结果表明在薄膜中存在较强的交换耦合作用,在经过685℃退火的薄膜中磁相互作用更加显著.
[Abstract]:Nd-Ce-Fe-B nano composite films have the characteristics of permanent magnet prepared by magnetron sputtering technology, and has carried on the annealing process. By changing the annealing temperature, to study its effect on thin film magnetic properties and crystal structure. The results show that with the increase of annealing temperature of thin film magnetic energy increases, but when the temperature reaches 695 DEG C when the magnetic properties of the films decreased sharply. When the annealing temperature is 675 degrees centigrade, the coercivity of Hci=10.1 thin film kOe (1Oe=79.5775 A/m), remanent magnetization direction perpendicular to the film surface 4 PI M_ (R group) =5.91 kG (1 G=10~3/ (4 N) A/m). X-ray diffraction results show that X thin films and magnetic films with c axis orientation better. Through the study of thin film magnetization reversal process, with the increase of the magnetic field, M_ (Rev) of the minimum value to M_ (IRR) reduced the moving direction and domain wall bending model similar to that present in the films The local strong pinning effect, and the residual magnetization curves show that the pinning effect is not a dominant role in the coercivity mechanism. In addition, the results show that the Henkel curve of film exchange strong coupling effects exist in the films, the films after annealing at 685 DEG C in the magnetic interaction is more significant.
【作者单位】：钢铁研究总院功能材料研究所;
【基金】：国家重点基础研究发展计划(批准号:2014CB643701) 国家自然科学基金(批准号:51571064)资助的课题~~
【分类号】：O484.43
【正文快照】： 永磁材料的概念,建立了交换耦合作用模型[10-13],1引言并从实验上验证了可以通过软硬磁之间的交换耦合作用实现剩磁增强效应,但对于不同硬磁纳米颗Nd-Fe-B磁体因其具有优异的磁性能而受到粒之间的交换耦合效应研究甚少.我们在研究软、科研人员的广泛关注[1-6],然而由于Ce2Fe14

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