Electric-Field-Induced Modification of the Magnon Energy, Exchange Interaction, and Curie Temperature of Transition-Metal Thin Films
Electric-Field-Induced Modification of the Magnon Energy, Exchange Interaction, and Curie Temperature of Transition-Metal Thin Films
复制标题
DOI：
10.1103/physrevlett.114.107202
复制
发表时间：
2015-03-13
影响因子：
8.6
通讯作者：
Freeman, A. J.
中科院分区：
文献类型：
--
作者：
Oba, M.;Nakamura, K.;Freeman, A. J.
用电场作用下自旋螺旋结构的第一性原理计算，研究了具有垂直磁易轴、自支撑Fe(001)单分子膜和铂(111)表面Co单分子膜的典型过渡金属薄膜的电场诱导居里温度变化.外加电场改变了磁振子(自旋-螺旋形成)的能量；这种变化是由于p-d杂化引起的自旋-螺旋态中的屏蔽电荷密度的变化。从磁振子能量得到的海森堡交换参数表明，居里温度是由电场引起的，这一点通过考虑磁晶各向异性的蒙特卡罗模拟得到了证实。
The electric-field-induced modification in the Curie temperature of prototypical transition-metal thin films with the perpendicular magnetic easy axis, a freestanding Fe(001) monolayer and a Co monolayer on Pt(111), is investigated by first-principles calculations of spin-spiral structures in an external electric field (E field). An applied E field is found to modify the magnon (spin-spiral formation) energy; the change arises from the E-field-induced screening charge density in the spin-spiral states due to p-d hybridizations. The Heisenberg exchange parameters obtained from the magnon energy suggest an E-field-induced modification of the Curie temperature, which is demonstrated via Monte Carlo simulations that take the magnetocrystalline anisotropy into account.