Structural and Magnetic Properties of Co ₂ MnSi Thin Film with a Low Damping Constant

Abstract

Co2MnSi thin films are made by magnetron sputtering onto MgO (001) substrates. The crystalline quality is improved by increasing depositing temperature and/or annealing temperature. The sample deposited at 550 ∘ C and subsequently annealed at 550 ∘ C (sample I) exhibits a pseudo-epitaxial growth with partially ordered 𝐿21 phase. Sample I shows a four-fold magnetic anisotropy, in addition to a relatively weak uniaxial anisotropy. The Gilbert damping factor of sample I is smaller than 0.001, much smaller than reported ones. The possible reasons responsible for the small Gilbert damping factor are discussed, including weak spin-orbit coupling, small density of states at Fermi level, and so on.

First-principles calculation of the effects of partial alloy disorder on the static and dynamic magnetic properties ofCo2MnSi

“…Concerning the Gilbert damping parameter, low values of the order of 4 × 10 −3 are generally reported in the literature [15][16][17][18][19], reduced below 10 −3 in the most recent studies [20][21][22][23]. These values are however still higher than the predicted ones calculated for the pure L2 1 phase.…”

“…However, most of the experimental values presented in the literature as belonging to the L2 1 phase give values around 4 × 10 −3 [15][16][17][18][19], more than 10 times higher than our numerical results. Recent experiments gave values of α smaller than 1 × 10 −3 [20,22,23]. A measured value as small as 1.5 × 10 −4 has even been reported very recently, which was obtained after a fitting procedure removing the two-magnons scattering contributions to the measured damping [21].…”

“…Belonging to this family of materials, the full-Heusler alloy Co 2 MnSi is a very promising candidate for spintronic applications. Since the theoretical prediction of its half-metallicity by first-principles calculations [14], intensive experimental and numerical studies have been performed on this material, highlighting a low damping parameter [15][16][17][18][19][20][21][22][23][24][25], in addition to the already known high Curie temperature [26].…”

Perpendicular magnetic anisotropy of Pd/Co2 MnSi/NiFe2O4/Pd multilayers on F-mica substrates

“…So it has attracted widespread attention from people in recent years. [9,10] CMS is a promising candidate material for magnetic recording. [11][12][13] Studies have shown that strong PMA can be induced by the interface effect between ferromagnetic metals (FM) and metal oxides (OX), such as CoFeB/MgO, Co/MgO, and Co 2 MnSi/NiO structures.…”