Temperature dependence of magnetization reversal processes in exchange-spring magnets

Title
Temperature dependence of magnetization reversal processes in exchange-spring magnets
Authors
Gu, J.Y.; Burgess, J.; You, C.Y.
Keywords
PERMANENT-MAGNETS, BILAYERS
Issue Date
2010-05
Publisher
AMER INST PHYSICS
Abstract
We investigated the temperature dependence of magnetization reversal processes of exchange-spring magnet, hard/soft ferromagnetic heterostructures. In most previous works, the thicknesses of the soft and hard layers were used as the main control parameters to investigate the reversal mechanism of the exchange-spring magnet. In our work, the anisotropy energy of the hard layer changes as a function of temperature, while the change in the magnetic properties of the soft layer is negligible in the temperature regime in which we are interested (between 10 and 300 K ). The magnetic hysteresis loops of SmFe/Py( = Ni80Fe20) and SmCo/Py exchange-spring magnets were measured at various temperatures. Magnetic reversal behaviors of SmFe/Py and SmCo/Py were explained using the parameters extracted from the single layer measurements, SmFe or SmCo films, and the existing theory, where the reversal mechanism is controlled by the thicknesses. With a proper conversion of the temperature dependent anisotropy energy to the scaled thickness scheme, the reversal mechanisms of SmFe/Py and SmCo/Py could be explained with a simple model theory for a wide range of temperatures.
URI
http://dspace.inha.ac.kr/handle/10505/20141
ISSN
0021-8979
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Journal Papers, Peports(물리학 학술논문, 보고서)
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