Magnetization reversal modes in fourfold Co nano-wire systems

4th International Conference on Mathematical Modeling in Physical Sciences

物理学;数学

Blachowicz, T.^1,3 ; Ehrmann, A.^2,3

Institute of Physics, Center for Science and Education, Silesian University of Technology, Gliwice

44-100, Poland^1

Faculty of Engineering Sciences and Mathematics, Bielefeld University of Applied Sciences, Bielefeld

33609, Germany^2

VIARAM-Virtual Institute for Applied Research on Advanced Materials, Poland^3

关键词: Complete system;    Magnetic storage media;    Magnetization reversal mechanisms;    Magnetization reversal process;    Material parameter;    Novel applications;    Patterned magnetic structure;    System geometry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/633/1/012100/pdf
DOI  :  10.1088/1742-6596/633/1/012100

来源: IOP

【 摘 要 】

Magnetic nano-wire systems are, as well as other patterned magnetic structures, of special interest for novel applications, such as magnetic storage media. In these systems, the coupling between neighbouring magnetic units is most important for the magnetization reversal process of the complete system, leading to a variety of magnetization reversal mechanisms. This article examines the influence of the magnetic material on hysteresis loop shape, coercive field, and magnetization reversal modes. While iron nano-wire systems exhibit flat or one-step hysteresis loops, systems consisting of cobalt nano-wires show hysteresis loops with several longitudinal steps and transverse peaks, correlated to a rich spectrum of magnetization reversal mechanisms. We show that changing the material parameters while the system geometry stays identical can lead to completely different hysteresis loops and reversal modes. Thus, especially for finding magnetic nano-systems which can be used as quaternary or even higher-order storage devices, it is rational to test several materials for the planned systems. Apparently, new materials may lead to novel and unexpected behaviour - and can thus result in novel functionalities.