Magnetization reversal in Nd-Fe-B based nanocomposites as seen by magnetic small-angle neutron scattering
Magnetization reversal in Nd-Fe-B based nanocomposites as seen by magnetic small-angle neutron scattering
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DOI：
10.1063/1.4776708
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发表时间：
2013-01-14
影响因子：
4
通讯作者：
Michels, Andreas
中科院分区：
文献类型：
--
作者：
Bick, Jens-Peter;Honecker, Dirk;Michels, Andreas
用小角中子散射研究了Nd2Fe14B/Fe3B纳米复合材料的磁化反转过程。基于自旋失配的自相关函数的计算，我们估算了Nd2Fe14B纳米粒子周围自旋不均匀的特征尺寸L(C)。在14T时，L(C)的量接近于一个约12.5 nm的常数(类似于Nd2Fe14B粒子的平均半径)，在-0.55T的矫顽场下出现最大值约18.5 nm。L(C)的场依赖关系可以用一个考虑核和磁微结构卷积关系的模型来描述。(C)2013年美国物理研究所。[http://dx.doi.org/10.1063/1.4776708]
We have studied the magnetization-reversal process of a Nd2Fe14B/Fe3B nanocomposite using small-angle neutron scattering. Based on the computation of the autocorrelation function of the spin misalignment, we have estimated the characteristic size l(C) of spin inhomogeneities around the Nd2Fe14B nanoparticles. The quantity l(C) approaches a constant value of about 12.5 nm (similar to average Nd2Fe14B particle radius) at 14 T and takes on a maximum value of about 18.5 nm at the coercive field of -0.55 T. The field dependence of l(C) can be described by a model that takes into account the convolution relationship between the nuclear and the magnetic microstructure. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4776708]