Influence of shape anisotropy on reversal process in coupled ellipsoidal magnetic dot array

Raanaei, Hossein; Eslamizadeh, H.

doi:10.1142/s0217979214502269

Int. J. Mod. Phys. B

2014

DOI: 10.1142/s0217979214502269

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Influence of shape anisotropy on reversal process in coupled ellipsoidal magnetic dot array

Hossein Raanaei

H. Eslamizadeh

Abstract: The magnetization reversal of two configurations of linear magnetic ellipsoidal arrays has been studied by using the micromagnetic simulations. The effect of magnetostatic interaction on the switching field is investigated by altering aspect ratio of ellipsoids while boundary edge spacing is kept fixed. The simulation results showed that, when the field is parallel to the ellipsoid easy axis, the shifted switching field is more than the case when the field is parallel to the ellipsoid hard axis. However, in bo… Show more

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Cited by 2 publications

References 23 publications

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Micromagnetic simulation of hysteresis loop of elliptic permalloy nanorings

Mishra¹

2016

Int. J. Mod. Phys. B

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Magnetic hysteresis behavior of isotropic permalloy elliptic nanorings of outer semi-major axis length [Formula: see text] 100 nm and thickness [Formula: see text] 20 nm were studied with respect to the variation of two parameters: outer semiminor axis length [Formula: see text] and the difference between outer and inner dimensions [Formula: see text]. The outer semiminor axis length [Formula: see text] varied from 90 nm to 20 nm which covers from nearly circular nanoring to elliptic nanoring of high aspect ratio. The value of [Formula: see text] varied in steps of 10 nm. Micromagnetic simulation of in-plane hysteresis curve of these nanorings revealed that the remanent state of all of these elliptic rings are onion states if the magnetic field is applied along the longer side of the elliptic rings. If the magnetic field is applied along the shorter side, then the remanent states turn out to be vortex state. The hysteresis loss indicated by area of the hysteresis loop was found to be decreasing gradually with the increment of either [Formula: see text] or [Formula: see text]. On the other hand, the remanent magnetization increased with increment of [Formula: see text] but decreased with the increment of [Formula: see text]. The changes were attributed to three parameters mainly: inner curvature, exchange energy and demagnetization energy. The changes in loop area were discussed in light of variation of these three parameters.

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Micromagnetic simulation of hysteresis loop of elliptic permalloy nanorings

Mishra¹

2016

Int. J. Mod. Phys. B

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Micromagnetic simulation study of magnetization reversal in torus-shaped permalloy nanorings

Mishra

Giri

2017

Int. J. Mod. Phys. B

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Using micromagnetic simulation, the magnetization reversal of soft permalloy rings of torus shape with major radius R varying within 20–100 nm has been investigated. The minor radius r of the torus rings was increased from 5 nm up to a maximum value r[Formula: see text] such that R- r[Formula: see text] = 10 nm. Micromagnetic simulation of in-plane hysteresis curve of these nanorings revealed that in the case of very thin rings (r [Formula: see text] 10 nm), the remanent state is found to be an onion state, whereas for all other rings, the remanent state is a vortex state. The area of the hysteresis loop was found to be decreasing gradually with the increment of r. The normalized area under the hysteresis loops (A[Formula: see text]) increases initially with increment of r. It attains a maximum for a certain value of r = r0 and again decreases thereafter. This value r0 increases as we decrease R and as a result, this peak feature is hardly visible in the case of smaller rings (rings having small R).

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Influence of shape anisotropy on reversal process in coupled ellipsoidal magnetic dot array

Cited by 2 publications

References 23 publications

Micromagnetic simulation of hysteresis loop of elliptic permalloy nanorings

Micromagnetic simulation of hysteresis loop of elliptic permalloy nanorings

Micromagnetic simulation study of magnetization reversal in torus-shaped permalloy nanorings

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