X-ray photoelectron spectroscopy and magnetism of AlDyNi, AlDyNi<sub>4</sub> and AlDy<sub>3</sub>Ni<sub>8</sub> compounds
V Rednic; M Coldea; L Rednic; L G Pascut; N Aldea; S Pintea; M Neumann
Журнал:
Journal of Physics: Conference Series
Дата:
2009-08-01
Аннотация:
The electronic and magnetic properties of AlDyNi, AlDyNi<sub>4</sub> and AlDy<sub>3</sub>Ni<sub>8</sub> are studied using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), static and dynamic magnetic measurements. The three compounds AlDyNi, AlDyNi<sub>4</sub> and AlDy<sub>3</sub>Ni<sub>8</sub> are single phases and crystallize in the Fe<sub>2</sub>P, CaCu<sub>5</sub> and CeNi<sub>3</sub> structure types, respectively. All the investigated compounds order ferromagnetically below the corresponding Curie temperatures. The Curie temperature and the magnetic moments are 25 K and 6 μ<sub>B</sub>/f.u. for AlDyNi, 14 K and 6.9 μ<sub>B</sub>/f.u. for AlDyNi<sub>4</sub> and 22K and 19.2 μ<sub>B</sub>/f.u. for AlDy<sub>3</sub>Ni<sub>8</sub>. At high temperature the magnetic susceptibility obey the Curie-Weiss law. The paramagnetic Curie temperature and the effective magnetic moments are 30K and 10.88 μ<sub>B</sub>/f.u. for AlDyNi, 28 K and 10.94 μ<sub>B</sub>/f.u. for AlDyNi<sub>4</sub> and 18 K and 18.33 μ<sub>B</sub>/f.u. for AlDy<sub>3</sub>Ni<sub>8</sub>. XPS valence band and Ni 2p spectra indicated the presence of small magnetic moment on Ni sites in AlDy<sub>3</sub>Ni<sub>8</sub> and AlDyNi<sub>4</sub>, and a complete filling of Ni 3d band in AlDyNi.
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