Metadynamics study of the temperature dependence of magnetic anisotropy and spin-reorientation transitions in ultrathin films
arXiv:1907.03616 · doi:10.1103/PhysRevB.100.174429
Abstract
We employ metadynamics simulations to calculate the free energy landscape of thin ferromagnetic films and perform a systematic study of the temperature dependence of magnetic anisotropy and of the spin-reorientation transitions. By using a simple spin model we recover the well-known power-law behavior of the magnetic anisotropy energy against magnetization and present a rather detailed analysis of the spin-reorientation transitions in ultrathin films. Based on tensorial exchange interactions and anisotropy parameters derived from first-principles calculations we perform simulations for Fe double layers deposited on Au(001) and W(110). In case of FeW(110) our simulations display an out-of-plane to in-plane spin-reorientation transition in agreement with experiments.
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