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The Azimuthal Dependence of Exchange Bias Effect and Its Analysis by Spin Glass Model in Ni0.8Fe0.2/CoxNi1-xO Bilayers

The Azimuthal Dependence of Exchange Bias Effect and Its Analysis by Spin Glass Model in Ni0.8Fe0.2/CoxNi1-xO Bilayers
Yoo, WoosukChoo, SeongminJo, SinyongYou, Chun-YeolHong, Jung-IlLee, KyujoonJung, Myung-Hwa
DGIST Authors
You, Chun-YeolHong, Jung-Il
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Author Keywords
Magnetic field measurementNickelTemperature dependenceMagnetic hysteresisMagnetic fieldsGlassSpintronicsantiferromagnetic materialsanisotropic magnetoresistanceTemperature measurement
Digital storageGlassMagnetic storageSpin glassAntiferromagnetic layersAntiferromagnetsAzimuthal dependenceBilayer thin filmsExchange bias effectsExchange-bias fieldsSpin valveSpin-glass modelsNickel compounds
Exchange bias (EB) effect has been vigorously researched for many years due to its possible applications in information storage and spintronics, especially in spin valves for magnetic recording devices. Even though many models have been expounded to this day, they do not prove convincingly the origins of EB effect. We attempt to establish the azimuthal dependence of EB effect with respect to varying the composition of the antiferromagnet CoxNi1-xO and temperature. In this report, we deposited the bilayer thin films of Ni0.8Fe0.2/CoxNi1-xO with x varying from 0.4 to 0.8 by magnetron sputtering and studied the variation of exchange bias field and coercivity. The EB effect was investigated for various external parameters such as temperature, the composition of antiferromagnetic layer, and the direction of magnetic field. The comparison between the calculations and experimental data showed good consistency with the spin glass model, and we suggest the validity of spin glass model to understand the origin of exchange bias effect in the Ni0.8Fe0.2/CoxNi1-xO bilayers.
Institute of Electrical and Electronics Engineers Inc.
Related Researcher
  • 유천열 You, Chun-Yeol 화학물리학과
  • Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
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Appears in Collections:
Department of Physics and Chemistry Spin Nanotech Laboratory 1. Journal Articles
Department of Physics and Chemistry Spin Phenomena for Information Nano-devices(SPIN) Lab 1. Journal Articles


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