Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 40: Electronic Structure of Magnetism, Micromagnetism, Computational Magnetism (organized by MA)

TT 40.9: Vortrag

Dienstag, 17. März 2015, 11:45–12:00, H 0112

Simulation of coercivities and magnetization reversal mechanisms in fourfold ferromagnetic systems of different dimensions and orientations — •Tomasz Blachowicz1 and Andrea Ehrmann21Silesian University of Technology, Institute of Physics, Poland — 2Niederrhein University of Applied Sciences, Faculty of Textile and Clothing Technology, Germany

The stability of magnetic states during magnetization reversal, especially at remanence, belongs to the important issues in examination of magnetic nanosamples. Our presentation gives an overview of different fourfold magnetic wire systems, simulated by Magpar. Wire lengths have been chosen from 30 nm to 70 nm, while the single wires have length-to-diameter ratios between 3 and 11. Simulations have been carried out for angular in-plane directions of the externally applied field from 0° (parallel to one pair of wires) to 45°. Depending on system dimensions and external field angle, different magnetization reversal mechanisms could be observed as well as changes between stable and instable magnetic states [1].

Intermediate states at vanishing external field, reached by minor loops starting at steps in the hysteresis loop, are of special interest for application in novel data storage media systems. The presentation shows different possibilities to create such states and examines their stability by comparing hysteresis loops, special distribution of magnetization, and exchange energy as function of the externally applied field for a number of sample dimensions and external field angles.

[1] T. Blachowicz, A. Ehrmann, J. Appl. Phys. 113, 013901 (2013)

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