Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Magnetic Thin Films I
MA 17.4: Vortrag
Mittwoch, 25. März 2009, 11:00–11:15, HSZ 04
Investigation of the magnetic properties in thin Fe50Pt50-xRhx films by neutron diffraction — •J. Fenske1, D. Lott1, G.J. Mankey2, W. Schmidt3, K. Schmalzl3, E. Tartakowskaya4, and A. Schreyer1 — 1GKSS Research Centre — 2The University of Alabama, MINT Center — 3Jülich Research Centre — 4Institute for Magnetism, National Accademy of Science
FePt-based alloys are typically the material of choice for magnetic information storage media. The high magnetic moment of Fe gives a large magnetization and the large atomic number of Pt results in a high magnetic anisotropy. This combination enables the written bits to be smaller than ever before, since magnetic grains with a high magnetic anisotropy are more thermally stable. One way to control the magnetic properties in these materials is through the introduction of a third element into the crystal matrix, e.g. Rh. When Rh is added to replace Pt in the equiatomic alloy, new magnetic phases emerge. Bulk samples of Fe50Pt40Rh10 for example, studied by magnetization measurements refer to an antiferromagnetic (AF)/ferromagnetic (FM) phase transition at about 150K when heated[1]. Additional magnetostriction measurements indicate that the phase transition could also be induced by applying a magnetic field[2]. Here we present results on several Fe50Pt50-xRhx films. These films were examined by neutron diffraction in dependence of temperature and magnetic field. The observed magnetic behaviours differ significant from the behaviour of the bulk system. [1] S. Yuasa, H. Miyajima and Y. Otani, J. Phys. Soc. Jpn. 63 (8), 1994 [2] P.A. Algarabel, et. al, J.Appl. Phys. 79 (8), 1996