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Salamon, Myron B. Hou, Ming-Kang 2011-06-07T15:14:31Z 2011-06-07T15:14:31Z 10000-01-01 1984 An ESR study on amorphous FexNi80-xP20 alloys was performed at 1.1 Ghz and 9.3 GHz, where x=8, 10, and 16. Fe8Ni72P20 and Fe10Ni70P20 show paramagnetic to spin-glass transitions, while Fe16N~4P20 shows paramagnetic to ferromagnetic and ferromagnetic to spin-glass transitions. The lineshape, at both frequencies, undergoes a progressive distortion as the temperature is reduced. We use an improved dynamical model to fit the distorted lineshapes and demonstrate that there is a tendency for the relaxation rate to vanish as is approached. In the Tf spin-glass regime, we also find a shift in resonance position, in addition to the dynamical one, which is due to the existence of a static anisotropy field in the spin-glass state. The anisotropic energy K(T) is found to be proportional to (I-T/Tf). The relaxation rate can be fitted to a power-law and an Arrhenius Law temperature behaviors, however only power-law fitting gives reasonable fitting values, which indicates that the phase transition model is better able to explain the spin-glass transition phenomena. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:14:31Z No. of bitstreams: 1 1984_hou.pdf: 2612983 bytes, checksum: d983ad338eccbbb8848ff9ece8bd784c (MD5) Made available in DSpace on 2011-06-07T15:14:31Z (GMT). No. of bitstreams: 1 1984_hou.pdf: 2612983 bytes, checksum: d983ad338eccbbb8848ff9ece8bd784c (MD5) Previous issue date: 1984 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T15:14:32Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:13:31-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 5259076 http://hdl.handle.net/2142/25317 en 1984 Ming-Kang Hou magnetic resonance amorphous iron-nickel alloys ESR study paramagnetic transitions spin-glass transitions Magnetic resonance in amorphous iron-nickel alloys Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.