Open AccessStudy of switching behavior of exchange-coupled nanomagnets by transverse magnetization metrology
Author(s) -
Himadri Dey,
György Csaba,
Gary H. Bernstein,
Wolfgang Porod
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4977721
Subject(s) - nanomagnet , condensed matter physics , exchange bias , ferromagnetism , materials science , spintronics , dipole , nucleation , magnetometer , coupling (piping) , magnetic dipole–dipole interaction , magnetization , micromagnetics , magnetic hysteresis , magnetic anisotropy , physics , magnetic field , quantum mechanics , metallurgy , thermodynamics
We investigate the static switching modes of nanomagnets patterned from antiferromagnetically exchange-coupled magnetic multilayers, and compare them to nanomagnets having only dipole coupling between the ferromagnetic layers. Vibrating sample magnetometry experiments, supported by micromagnetic simulations, reveal two distinct switching mechanisms between the exchange-coupled and only dipole-coupled nanomagnets. The exchange-coupled nanomagnets exhibit gradual switching of the layers, dictated by the strong antiferromagnetic exchange coupling present between the layers. However, the layers of the only dipole-coupled nanomagnets show abrupt nucleation/growth type switching. A comprehensive understanding of the switching modes of such layered and patterned systems can add new insight into the reversal mechanisms of similar systems employed for spintronic and magneto-logic device applications
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