Characteristics of magnetic domain deflection of Tb_0.3Dy_0.7Fe₂ alloy

详细信息    查看全文

• 作者：Caofeng YU (喻曹丰) ; Chuanli WANG (王传礼) ; ^{chlwang@aust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Haishun DENG (邓海顺) ; Tao HE (何 涛) ; Changming ZHONG (钟长鸣)
• 关键词：Tb0.3Dy0.7Fe2 alloy ; magnetic domain ; magnetization angle ; Stoner-Wohlfarth model ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：34
• 期：9
• 页码：882-888
• 全文大小：1789 K

文摘

In order to expand the applications of giant magnetostrictive materials in the field of precision positioning, an extreme value model of free energy was established with deflection angle of magnetic domain as the independent variable from the microscopic aspect. The model was based on Stoner-Wohlfarth (S-W) model wherein Tb_0.3Dy_0.7Fe₂ alloy was taken as a research object, and the deflection law of magnetization angle of single magnetic domain was studied through drawing the equipotential curves and changing curves of free energy function under different applied stresses and in different magnetic fields. Research results showed that there were three kinds of magnetization angles of single magnetic domain as for Tb_0.3Dy_0.7Fe₂ alloy, namely 35.26°, 90° and 144.74°; under the action of applied stresses, the magnetization angles θ were deflected to the direction of 90° for the magnetic domains of 35.26° and 144.74° and the magnetization angles ψ were changed and transited to the direction of ψ=135° for the magnetic domain of 90°; the magnetic domain was deflected under the action of small magnetic field for magnetic domain of 35.26°; with the increase of magnetic field intensity, the magnetic domain of 90° had a transition trend to a stationary planar of ψ=ψ₀; the magnetic domain of 144.74° had a transition trend to the direction of magnetic domain of 35.26°. These results laid a foundation for the magnetostrictive mechanism and establishment of precision positioning theories of the giant magnetostrictive materials.