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Modelling of Pinning‐Depinning Reversal Mechanism in Ion‐Irradiated Co/Al 2 O 3 Thin Films
Author(s) -
Goyal Rajan,
Gupta Rekha,
Negi Ambika,
Asokan Kandasami,
Kanjilal Dinakar,
Lamba Subhalakshmi,
Annapoorni Subramanian
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800141
Subject(s) - condensed matter physics , coercivity , materials science , pinning force , ion , lattice (music) , anisotropy , geomagnetic reversal , irradiation , monte carlo method , thin film , critical current , magnetic field , nanotechnology , physics , optics , nuclear physics , superconductivity , statistics , mathematics , quantum mechanics , acoustics
Present study reports the pinning–depinning mechanism in Co embedded Al 2 O 3 matrix subjected to Ar + ion irradiations. Angular variation studies of the scaled coercivity are carried out and a comparison to existing theoretical models indicates that the dominant reversal mechanism is due to pinning. The origin of pinning is attributed to the displacement of Co atoms from their lattice sites, as a result of ion bombardment. The Monte Carlo simulations suggest that the observed magnetic behavior is well explained by pinning induced strain anisotropy in the system.