返回信息流Magnetization dynamics and Gilbert damping properties of MBE-
grown Co2FeAl film——(“青年论坛”第22期)
讲座题目：Magnetization dynamics and Gilbert damping
properties of MBE-grown Co2FeAl film
主讲人： 张新惠 研究员主持人： 唐为华 教授时 间： 2014年10月9日（周四）上午10：30－11：30地 点： 主楼－1214
主要内容：
Co-based full-Heusler alloys have been revealed to behave like
half-metals even at room temperature. The highly-ordered Co2FeAl
with an ideal L21 structure has been predicted to be half-metal,
with a well-defined band gap in the minority spin channel. However,
its magnetic and damping properties, which are fundamental for
spintronics application, have not been investigated in detail
before. In this work, the magnetization dynamics and Gilbert damping
property for highly-ordered MBE-grown Co2FeAl films were
investigated in detail by combining both the ferromagnetic
resonance (FMR) and time-resolved magneto-optical Kerr effect
(TR-MOKE) techniques. The apparent damping parameter was found to
show strong dependence on both the strength and directions of the
applied magnetic field at low-field regime, but decrease drastically
with increasing magnetic field and eventually become a constant
value of 0.0034 at high-field regime, which is deduced to be the
intrinsic damping parameter of Co2FeAl films. The inhomogeneous
dispersion of magnetocrystalline anisotropy and two-magnon
scatterings is suggested to be the extrinsic damping contribution
for epitaxial Co2FeAl films. Meanwhile the anisotropic and field-
independent damping factor obtained at high fields indicates that
the observed magnetic damping anisotropy is an intrinsic property
for epitaxial Co2FeAl thin films. The low intrinsic damping factor
and its intrinsic anisotropy property observed in this work is
fundamentally important for designing spin-transfer-torque-driven
devices based on Co2FeAl films.
主讲人简介：
张新慧，中国科学院半导体研究所超晶格国家重点实验室研究员，博士生导师，2007 年中科院“百人计划” 获得者。1997 年中国科学院物理研究所获理学博士学位。1997 年至2005 年分别在瑞典隆德大学固体物理系、美国威廉-玛丽学院应用科学系、美国俄克拉荷马大学物理系以及加拿大蒙可顿大学物理系做博士后与助理研究员工作。2006 年起为中国科学院半导体所研究员。一直从事低维半导体材料的线性与非线性红外激光光谱及超快光谱研究，目前研究领域为半导体自旋电子学。主要利用超快光谱技术研究半导体量子结构以及铁磁薄膜中电子与自旋的超快激发与弛豫动力学过程及其调控的新物理与新现象。
欢迎全校感兴趣的师生前来参加！
北京邮电大学理学院
http://portal.bupt.edu.cn//html/main/col38/2014-10/08/20141008091037414365693_1.html
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理学院“青年论坛”第22期
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