Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Magnetic Heuslers, Half-Metals and Oxides I (organized by MA)

TT 10.2: Talk

Monday, March 31, 2014, 09:45–10:00, BEY 118

Structural and magnetic properties of the Heusler system Mn-Fe-Ga — •Ajaya Kumar Nayak, Adel Kalache, Michael Nicklas, and Claudia Felser — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

In recent time Mn based Heusler alloys received significant research interest as they show several interesting fundamental as well as functional properties. In particular, Mn₂YZ based materials are considered to be promising candidates for spintronics and spin-torque transfer (STT) applications due to a large spin polarization of the conduction electrons and a large anisotropy in tetragonal phase. The tetragonal ferrimagnetic (FI) compound Mn₃Ga is the center of attraction due to its low saturation magnetization, high Curie temperature (T_C), and high spin polarization. To further tune the magnetic properties of the system we substitute Mn by Fe to obtain Mn₂FeGa up to Fe₂MnGa. All samples crystallize in a pseudo-cubic structure when annealed at 1073 K. Mn₂FeGa undergoes second order paramagnetic (PM) to antiferromagnetic (AFM) ordering around 350 K. In contrast, Fe₂MnGa shows The sample shows a PM to ferromagnetic (FM) ordering around 800 K followed by a first-order FM-AFM transition around 300 K. Here, we present a complete study of the magnetic properties of the Mn-Fe-Ga system with help of various magnetization measurements.