Micromagnetic simulation and the angular dependence of coercivity and remanence for array of polycrystalline nickel nanowires

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:423

Article

Fuentes, G. P.¹  Holanda, J.¹  Guerra, Y.²  Silva, D. B. O.²  Farias, B. V. M.²  Padron-Hernandez, E.^1,2 

[1] Univ Fed Pernambuco, Dept Fisica, BR-50670901 Recife, PE, Brazil

[2] Univ Fed Pernambuco, Pos Graduacao Ciencia Mat, BR-50670901 Recife, PE, Brazil

关键词: Magnetic nanowires;    Micromagnetic simulation;    Coercivity;    Magnetic remanence;   

DOI  :  10.1016/j.jmmm.2016.09.107

来源: Elsevier

【 摘 要 】

We present here our experimental results for the preparation and characterization of nanowires of nickel and the analysis of the angular dependence of coercivity and remanence using experimental data and micromagnetic simulation. The fabrication was made by using aluminum oxide membranes as templates and deposited nickel by an electrochemical route. The magnetic measurements showed that coercivity and remanence are dependent of the angle of application of the external magnetic field. Our results are different than that expected for the coherent, vortex and transversal modes of the reversion for the magnetic moments. According to the transmission electron microscopy analysis we can see that our nanowires have not a perfect cylindrical format. That is why we have used the ellipsoids chain model for better understanding the real structure of wires and its relation with the magnetic behavior. In order to generate theoretical results for this configuration we have made micromagnetic simulation using Nmag code. Our numerical results for the realistic distances are in correspondence with the magnetic measurements and we can see that there are contradictions if we assume the transverse reversal mode. Then, we can conclude that structure of nanowires should be taken into account to understand the discrepancies reported in the literature for the reversion mechanism in arrays of nickel nanowires.

【 授权许可】

Free