Inhaltszusammenfassung

We investigate the martensitic transition of single crystalline Ni2MnGa(110)?Al2O3(112? 0) and Ni2MnGa(100)?MgO(100) films using magnetometry, x-ray diffraction, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism. The martensitic transition from the cubic austenite phase to the low symmetry martensite phase depends strongly on the chosen substrate. For (110) oriented films on Al2O3, the martensitic phase is significantly more stable than for the (100) oriented films on MgO. ...We investigate the martensitic transition of single crystalline Ni2MnGa(110)?Al2O3(112? 0) and Ni2MnGa(100)?MgO(100) films using magnetometry, x-ray diffraction, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism. The martensitic transition from the cubic austenite phase to the low symmetry martensite phase depends strongly on the chosen substrate. For (110) oriented films on Al2O3, the martensitic phase is significantly more stable than for the (100) oriented films on MgO. A remarkable change of the Ni x-ray absorption spectra occurs at the transition, indicating specific changes of the electronic structure. The observed changes are in agreement with theoretical predictions. The orbital to spin momentum ratio of the Ni moment increases significantly on entering the martensite state, thus explaining the macroscopic increase of magnetic anisotropy.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik