|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Magnetic Anisotropy of Epitaxially Grown L10 Mn-(Ga,Al) Alloy Thin Films
||Takao Suzuki, Siqian Zhao
|On-Site Speaker (Planned)
The <I>L1<SUB>0</SUB></I> MnAl and MnGa are known to exhibit the high magnetic anisotropy constant K of 10<SUP>7</SUP>erg/cc at room temperature. A recent experimental work suggested that the K(T) for <I>L1<SUB>0</SUB></I> MnAl nano-crystalline thin films linearly decreases with saturation magnetization M<SUB>s</SUB>(T).<SUP>1</SUP> On the other hand, the K for the <I>L1<SUB>0</SUB></I> MnGa nano-crystalline thin films exhibited the 8<SUP>th</SUP> power dependence on M<SUB>s</SUB>(T).<SUP>2</SUP> Those experimental results are at variance with a single ion model where one would expect the major contribution of Mn to the magnetic anisotropy, thus expect the 3<SUP>rd</SUP> or higher power dependence. Epitaxially grown thin films of <I>L1<SUB>0</SUB></I> MnGa have been successfully fabricated onto MgO(100) single crystal substrates by sputter-deposition. The magnetic anisotropy constant K measured by a torque method over a temperature range from 5 to 400K is discussed in conjunction with the temperature change of M<SUB>s</SUB>. The work was partially supported by NSF-CMMI 1229049. References: 1.S. Zhao,et al.: IEEE Trans.MAG.51, 2101604(2015); 2.S. Zhao,et al.: AIP Advances,6,056025(2016).