Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.138: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Magnetic properties of the tetragonal Mn_3−xGa (0≤x≤1) system — •Jürgen Winterlik, Benjamin Balke, Gerhard H. Fecher, and Claudia Felser — Johannes Gutenberg-Universität Mainz

Recently the cubic DO₃ phase of the compound Mn₃Ga was predicted to be a half-metallic completely compensated ferrimagnet. A tetragonal distortion of the cubic lattice to the DO₂₂ structure leads to a change in magnetic properties of the compound.

A series of samples of tetragonal Mn_3−xGa was prepared in the range of (0≤x≤1) by arcmelting under argon atmosphere and annealing the resulting samples in evacuated quartz tubes at 350^∘C for one week. XRD measurements prove that the DO₂₂ structure could be realised in the whole concentration range.

Magnetic measurements were carried out by SQUID magnetometry. All samples show hardmagnetic behaviour. The Curie temperature of the materials cannot be specified due to a phase transition to the hexagonal DO₁₉ phase at about 700-800K. The results are evaluated and discussed regarding the Mn-concentration.