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RESEARCH PRODUCT
Epitaxial films of the magnetic shape memory material
Gerhard JakobH. J. Elmerssubject
Materials scienceMagnetic momentCondensed matter physicsMagnetic circular dichroismSputter depositionCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionSQUIDMagnetizationNuclear magnetic resonanceMagnetic shape-memory alloylawSapphireCurie temperaturedescription
Abstract By DC-sputtering from a stoichiometric target onto sapphire substrates we prepared epitaxial films of Ni 2 MnGa . X-ray diffraction in two circle geometry shows only the Ni 2 MnGa peaks corresponding to a (1 1 0) oriented growth on the (1 1 0) oriented sapphire substrate. Rocking curve scans shows that the out of plane orientation has a width of only 1 . 1 ∘ . By four circle X-ray diffraction we find an in-plane aligned growth. The Curie temperature as determined by SQUID magnetometry is 368 K. On cooling down the low field magnetization drops at around 260–280 K indicating the austenite to martensite transition. The presence of two different phases at high and low temperature also shows up in temperature-dependent X-ray measurements. The element specific magnetic moments for thin film samples have been determined by magnetic circular X-ray dichroism (XMCD) measurements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-03-01 | Journal of Magnetism and Magnetic Materials |