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Materials 2016, 9(6), 426; doi:10.3390/ma9060426

Engineering and Scaling the Spontaneous Magnetization Reversal of Faraday Induced Magnetic Relaxation in Nano-Sized Amorphous Ni Coated on Crystalline Au

Department of Physics, National Central University, Jhongli 32001, Taiwan
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Academic Editor: Beatriz Noheda
Received: 10 March 2016 / Revised: 25 April 2016 / Accepted: 25 May 2016 / Published: 28 May 2016
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

We report on the generation of large inverse remanent magnetizations in nano-sized core/shell structure of Au/Ni by turning off the applied magnetic field. The remanent magnetization is very sensitive to the field reduction rate as well as to the thermal and field processes before the switching off of the magnetic field. Spontaneous reversal in direction and increase in magnitude of the remanent magnetization in subsequent relaxations over time were found. All of the various types of temporal relaxation curves of the remanent magnetizations are successfully scaled by a stretched exponential decay profile, characterized by two pairs of relaxation times and dynamic exponents. The relaxation time is used to describe the reduction rate, while the dynamic exponent describes the dynamical slowing down of the relaxation through time evolution. The key to these effects is to have the induced eddy current running beneath the amorphous Ni shells through Faraday induction. View Full-Text
Keywords: Au/Ni core/shell nanoparticle; amorphous Ni nanoparticle; Faraday induction; remanent magnetization; time relaxation Au/Ni core/shell nanoparticle; amorphous Ni nanoparticle; Faraday induction; remanent magnetization; time relaxation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, W.-H.; Lee, C.-H.; Kuo, C.-C. Engineering and Scaling the Spontaneous Magnetization Reversal of Faraday Induced Magnetic Relaxation in Nano-Sized Amorphous Ni Coated on Crystalline Au. Materials 2016, 9, 426.

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