Magnetic properties of MnPt
- Iowa State Univ., Ames, IA (United States)
The magnetic properties of quenched and annealed powder specimens of MnPt were investigated using x-ray diffraction, magnetization measurements and neutron diffraction techniques. Thin films of MnPt were prepared by rf sputtering techniques and the films were investigated by x-ray diffraction and magnetization measurements. The powder specimens of MnPt were found to be typically antiferromagnetic in an L10 structure with Mn atoms occupying the (001) planes. The Mn moments were antiparallel to their nearest neighbors in the (001) planes. The atomic moment of Mn is (4.1 ± .2)μB for the annealed specimens and (3.9 ± .2) μB for the quenched specimens. Neutron data failed to determine whether or not Pt carries a moment. Assuming a moment associated with the Pt atoms, the maximum value is 0.2μB per atom. The quenched specimens contained small ferromagnetic regions probably with a composition of 18-32 at. percent Mn. The sputtered films of MnPt were highly disordered in all but one specimen, which was amorphous. The films were ferromagnetic with the deduced Mn moment of (3.0 ± .3) μB per atom, which may not represent the true value because the films were not entirely ferromagnetic.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 7095040
- Report Number(s):
- IS-T-766
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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