講演情報
[23a-12D-7]Anisotropy of the Gilbert damping constant of NiFe grown on non-collinear antiferromagnet Mn3Sn
〇(D)甲崎 秀俊1、坂本 祥哉1、畑尻 天平1、肥後 友也1,2、中辻 知1,2,3、三輪 真嗣1,3 (1.東大物性研、2.東大理、3.東大TSQS)
キーワード：
反強磁性体スピントロニクス,時間分解磁気光学カー効果,カイラル反強磁性体
Chiral antiferromagnet is a category of materials which has a non-colinear antiferromagnetic spin structure, represented by D019-Mn3Sn, and has ferroic magnetic order while being antiferromagnet. Epitaxial thin films of Mn3Sn have been developed, and research on spintronics devices using Mn3Sn has been widely carried out recently. Although most of the research on spintronics devices uses multilayer with Mn3Sn and ferromagnetic metal, the spin dynamics of ferromagnetic metal contacted with Mn3Sn is not clear. In this research, a multilayer sample including Mn3Sn/NiFe was fabricated and the magnetic properties of NiFe contacted with Mn3Sn were investigated using time-resolved magneto-optical Kerr effect (TR-MOKE).
MgO(110) substrate/W (7 nm)/Mn3Sn (20 nm)/MgO (0-3.5 nm)/Ni81Fe19 (4 nm) structure was fabricated by epitaxial growth method. The magnetic properties, in particular the Gilbert damping constant, were evaluated from free induction decay obtained using TR-MOKE. Enhancement of Gilbert damping constant of NiFe induced by Mn3Sn was obtained where the thickness of the MgO insertion layer is less than 1 nm. Comparison of the results with previous research and anisotropy of the damping constant will be discussed in the presentation.
MgO(110) substrate/W (7 nm)/Mn3Sn (20 nm)/MgO (0-3.5 nm)/Ni81Fe19 (4 nm) structure was fabricated by epitaxial growth method. The magnetic properties, in particular the Gilbert damping constant, were evaluated from free induction decay obtained using TR-MOKE. Enhancement of Gilbert damping constant of NiFe induced by Mn3Sn was obtained where the thickness of the MgO insertion layer is less than 1 nm. Comparison of the results with previous research and anisotropy of the damping constant will be discussed in the presentation.