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Thermally Initiated Reversal Modes in Infinite Periodic Ferromagnetic Wires

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4 Author(s)
Van de Wiele, B. ; Dept. of Electr. Energy, Ghent Univ., Ghent, Belgium ; Dupre, L. ; Olyslager, F. ; De Zutter, D.

In finite ferromagnetic wires, the demagnetizing effects along the wire axis have a substantial influence on the reversal processes. By considering infinite wires, these effects are annihilated and only the sample dimensions, cross-sectional geometry, and material properties determine the magnetization reversal. The magnetization reversal is now initiated by small thermal fluctuations. With decreasing cross-sectional dimensions, three different reversal modes can be distinguished: reversal with (i) domain formation; (ii) vortex formation; and (iii) precessional switching combined with buckling. For different cross-sectional dimensions and lattice axes orientations, the 3-D magnetization dynamics and evolution of the different micromagnetic energy terms are investigated, resulting in a clear understanding of the reversal modes.

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Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 11 )