Magnetization processes and magnetostriction of Tb0.27Dy0.73Fe2 single crystal along 〈110〉 direction
Magnetization processes and magnetostriction of Tb0.27Dy0.73Fe2 single crystal along 〈110〉 direction
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DOI：
10.1063/1.1540061
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发表时间：
2003-05
影响因子：
3.2
通讯作者：
B. Wang;S. Busbridge;Zhi-jun Guo;Zhidong Zhang
中科院分区：
文献类型：
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作者：
B. Wang;S. Busbridge;Zhi-jun Guo;Zhidong Zhang
用应变片、振动样品磁强计和磁畴观察技术研究了无孪晶Tb_（0.27）Dy_（0.73）Fe_2单晶沿着[110]方向的磁致伸缩和磁化过程。结果表明，当H<1 kOe时，样品的磁致伸缩随磁场的增加基本不变，而在1<H<7.5kOe时，样品的磁致伸缩随磁场的增加迅速增加。当H<2.5kOe时，磁化过程中没有出现“跳跃”现象，磁致伸缩滞后较大。在室温下通过Bitter胶体技术观察到弯曲的畴壁在{100}和{111}中分别在较高和较低的温度下变成直的，这表明当H<1 kOe时转变为不同的180度畴壁。{100}面上的磁畴图案最清晰。在1.5kOe <H<4kOe范围内，在自旋重取向温度以上，109 D和71 D壁运动占主导地位，而在此温度以下，观察到明显的90D壁运动。在不同的温度下观察到磁化畴图案的变化不大，这表明许多畴壁占据相同的平面。沿[111]沿着施加的应力超过5 MPa时，在剩磁处观察到类似的室温模式。这些结果与基于[1uu]，0<u<1，易磁化方向上的转变的理论磁力学行为一致。(C)2003年，美国物理学会。
The magnetostriction and magnetization process of a twin-free Tb0.27Dy0.73Fe2 single crystal along the [110] direction has been studied by strain gauge, vibrating sample magnetometer, and domain observation techniques. It was observed that the magnetostriction of the sample remained unchanged with increasing magnetic fields when H<1 kOe and quickly increased in the range 1<H<7.5 kOe. No "jump" effect was observed during the magnetization process and the magnetostrictive hysteresis was large when H<2.5 kOe. Observations by the Bitter colloid technique at room temperature revealed curved domain walls which became straight at higher and lower temperatures in {100} and {111}, respectively, indicating the transition to different 180degrees walls for H<1 kOe. The domain patterns were clearest on a {100} surface. Above the spin reorientation temperature, 109D and 71D wall motions dominated the magnetization process in the range 1.5 kOe<H<4 kOe, but below it, clear 90D wall motions were observed. Little change in the magnetized domain pattern was observed at different temperatures suggesting that many domain walls occupy the same planes. Similar room temperature patterns were observed at remanence with an applied stress along [111] in excess of 5 MPa. These results are consistent with theoretical magnetomechanical behavior based on a [1uu], 0<u<1, transition in easy direction. (C) 2003 American Institute of Physics.