Temperature Dependence of Exchange Bias and Coercivity in Ferromagnetic Layer Coupled with Polycrystalline Antiferromagnetic Layer |
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Authors: | ZHAO Jin-Wei HU Jing-Guo CHEN
Guang |
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Institution: | 1. Department of Materials Science & Engineering, Nanjing
University of Science and Technology, Nanjing 210094, China
;2. College of Physics Science & Engineering,
Yangzhou University, Yangzhou 225002, and National Laboratory of Solid State
Microstructures, Nanjing University, Nanjing 210093, China
;3. Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing 210001, China |
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Abstract: | The temperature dependence of exchange bias and coercivity in a
ferromagnetic layer coupled with an antiferromagnetic layer is discussed. In
this model, the temperature dependence comes from the thermal instability of
the system states and the temperature modulated relative magnetic
parameters. Morever, the thermal fluctuation of orientations of easy axes of antiferromagnetic grains at preparing has been considered. From the present model, the experimental results can be illustrated qualitatively for
available magnetic parameters. Based on our discussion, we can conclude that
soft ferromagnetic layer coupled by hard antiferromagnetic layer may be very
applicable to design magnetic devices. In special exchange coupling, we can
get high exchange bias and low coercivity almost independent of temperature for proper temperature ranges. |
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Keywords: | ferromaagnetic layer antiferromagnetic layer |
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