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The influence of dipolar interaction on magnetic properties in nanomagnets with different shapes
Author(s) -
Li Ying,
Wang TianXing,
Li YangXian
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945471
Subject(s) - nanomagnet , condensed matter physics , dipole , hysteresis , remanence , magnetic dipole–dipole interaction , magnetization , nucleation , magnetic hysteresis , physics , magnetic field , quantum mechanics , thermodynamics
With the Monte Carlo method, we investigate the magnetic properties of four nanomagnets of different shapes, i.e., the circular‐shaped, the square‐shaped, the elliptical, and the ring‐shaped nanomagnets. A systematic study of the effects of the dipolar interaction on the magnetic configurations is performed in these nanomagnets, and further the coercive field and the remanence as a function of dipolar interaction are analyzed. The results show that the magnetic configuration and thus the magnetization reversal process of nanomagnets are dependent strongly on the strength of dipolar interactions. For the case of small dipolar interaction, the magnetization reversal process is mainly dominated by spin rotation, while the reversal transforms to the vortex nucleation and propagation formations with increasing dipolar interaction. Moreover, if the dipolar interaction is neglected in the calculation of the total energy, no clear difference is found among hysteresis loops of four nanomagnets with same areas, but the inclusion of dipolar interaction can lead to different hysteresis loops for nanomagnets with same areas but different shapes. This indicates that the dipolar interaction is important for accounting for the shape effect of the magnetic properties in nanomagnets.