Inelastic neutron scattering measurements on Nd2Fe14B and Y2Fe14B single crystals
Inelastic neutron scattering measurements on Nd2Fe14B and Y2Fe14B single crystals
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Nd2Fe14B 和 Y2Fe14B 单晶的非弹性中子散射测量
DOI：
10.1016/0304-8853(92)90590-k
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发表时间：
1992
影响因子：
2.7
通讯作者：
R. Verhoef
中科院分区：
文献类型：
--
作者：
H. Mayer;M. Steiner;N. Stüβer;H. Weinfurter;B. Dorner;P. Lindgård;K. Clausen;S. Hock;R. Verhoef
对Nd_2Fe_（14）B和Y_2Fe_（14）B单晶进行了中子非弹性散射测量。在高对称方向[0，0，1]和[1，0，0]上发现了与温度有关的声磁振子色散曲线，能隙位于（0，0，2）。在自旋重取向温度附近观察到Nd_2Fe_（14）B在自旋波矢q = 0处的软模行为。非弹性散射强度随q的增大而急剧下降。因此，色散曲线只能测量到布里渊区的中间。在经典自旋波模型的框架下对实验结果进行了讨论。
Inelastic neutron scattering measurements have been carried out on Nd2Fe14B and Y2Fe14B single crystals. Temperature dependent acoustic magnon dispersion curves have been found along the high-symmetry directions [0,0,1] and [1,0,0] with a gap at (0,0,2). Soft mode behaviour at spin wave vectorq= 0 was observed for Nd2Fe14B near the spin reorientation temperature. The inelastic scattering intensity decreases steeply for largerq. Therefore, the dispersion curves could be measured until the middle of the Brillouin zone only. The experimental results are discussed in the frame of a classical spin wave model.