摘要： 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. 其他題名： Materials (Basel) 出版者： Switzerland: MDPI AG 出版日期： 2016-05-28 出處： Materials, 2016-05, Vol.9 (6), p.426-426 資源來源： Publicly Available Content Database 版權： Copyright MDPI AG 2016 版權： 2016 by the authors; 2016 識別號： ISSN: 1996-1944 識別號： EISSN: 1996-1944 識別號： DOI: 10.3390/ma9060426 識別號： PMID: 28773549
