凝聚态物理
材料科学
费米能级
磁化
磁各向异性
化学计量学
饱和(图论)
相(物质)
物理
磁场
化学
数学
量子力学
组合数学
电子
有机化学
作者
Jiarui Chen,Yuting Gong,Xianyang Lu,Chenyu Zhang,Yong Hu,Mingzhi Wang,Zhong Shi,Shuai Fu,Hongling Cai,Ruobai Liu,Yuan Yuan,Yu Lu,Tianyu Liu,Biao You,Yongbing Xu,Jun Du
标识
DOI:10.1088/0256-307x/40/4/047501
摘要
We investigate the structural, static magnetic and damping properties in two Mn-deficient magnetic Weyl semimetal Co-Mn-Ga (CMG) alloy films, i.e., Co 55 Mn 18 Ga 27 (CMG1) and Co 50 Mn 18 Ga 32 (CMG2), which were epitaxially grown on MgO (001) substrates. CMG1 has a mixing phase of B 2 and L 2 1 , larger saturation magnetization ( M s ∼ 760 emu/cm 3 ), stronger in-plane magnetic anisotropy. CMG2 has an almost pure B 2 phase, smaller M s (∼ 330 emu/cm 3 ), negligible in-plane magnetic anisotropy. Time-resolved magneto-optical Kerr effect results unambiguously demonstrate an obvious perpendicular standing spin wave (PSSW) mode in addition to the Kittel mode for both of the CMG films. The intrinsic damping constant is about 0.0055 and 0.015 for CMG1 and CMG2, respectively, which are both significantly larger than that of the stoichiometric CMG (i.e., Co 2 MnGa) film reported previously. In combination with the first-principles calculations, the intrinsic damping properties of the Mn-deficient CMG films can be well explained by considering the increase of density of states at the Fermi level, reduction of M s , and excitation of the PSSW mode. These findings provide a new clue to tuning the magnetic damping of the magnetic Weyl semimetal film through slight off-stoichiometry.
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