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DPG

Regensburg 2007 – scientific programme

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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

Tuesday, March 27, 2007, 15:00–19:00, Poster A

Magnetic properties of the tetragonal Mn3−xGa (0≤x1) 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 Mn3−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 350C 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.

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