Magnetization reversal and ground states in thin truncated conical nanodisks: Analytical and micromagnetic modelling approach

Sahu, Rahul; Mishra, Amaresh Chandra

doi:10.1016/j.jmmm.2022.169356

Cited by 10 publications

(2 citation statements)

References 40 publications

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“…However, the extent of curling of the magnetization at the corners increase with the tapering of conical double disks (figures 3(d)-(i)). This feature is quite similar to that of an isolated conical nanodisks [24].…”

Section: Magnetic Field Applied Along X-axissupporting

confidence: 72%

“…Some researchers have studied the magnetic behaviour of a nanometre-size full cone due to its applicability in point contact devices like magnetic force microscopes and spin polarized scanning tunnelling microscopes [23]. In thin truncated conical nanodisks of Permalloy, vortex configuration is the ground state for a wide range of geometrical parameters, and a shifted vortex state is exhibited as metastable state that occurs as a remanent state in in-plane magnetization reversal due to the presence of an energy barrier [24]. In the present work, we perform micromagnetic simulations to investigate the magnetization reversal of Permalloy truncated conical double-disk structures as a function of the tapering the conical disks.…”

Section: Introductionmentioning

confidence: 99%

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In plane magnetization reversal in nanosized thin truncated conical double-disks of permalloy

Sahu¹,

Tandon²,

Mishra³

2022

Modelling Simul. Mater. Sci. Eng.

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In plane magnetization reversal of permalloy thin truncated conical double-disk as a function of the σ = r/R is investigated using micromagnetic simulations with fixed base radius (R) of 100 nm. When external magnetic field is applied along the longer axis of the double-disk, the remanent states change gradually from vortex state to S state and then to buckled magnetization state with reduction of σ. When σ ≈ 1 and the conical nanodisk resembles to a regular cylindrical nanodisk, incoherent magnetization reversal is dominant whereas tapering of conical disk reduces extent of incoherence in magnetization reversal. As tapering of nanodisk goes extreme so that σ ≈ 0.1, the magnetization reversal is governed only by coherent rotation. Correspondingly, coercive field reduces monotonically as σ increases. On the other hand, when a field is applied in plane but perpendicular to the long axis, almost zero coercivity is discovered. These variations are explained using a analytical calculation of demagnetization factors which quantifies shape anisotropy as well as the consideration of incoherence in magnetization reversal.

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Section: Magnetic Field Applied Along X-axissupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%