Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks

The topological nature of the magnetic-vortex state gives rise to peculiar magnetization reversal observed in magnetic microdisks. Interestingly, magnetostatic and exchange, energies which, drive this reversal can be effectively controlled in artificial ferrimagnet heterostructures composed of rare-...

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Veröffentlicht in:Journal of applied physics 2017-08, Vol.122 (8)
Hauptverfasser: Lapa, Pavel N., Ding, Junjia, Phatak, Charudatta, Pearson, John E., Jiang, J. S., Hoffmann, Axel, Novosad, Valentine
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container_issue 8
container_start_page
container_title Journal of applied physics
container_volume 122
creator Lapa, Pavel N.
Ding, Junjia
Phatak, Charudatta
Pearson, John E.
Jiang, J. S.
Hoffmann, Axel
Novosad, Valentine
description The topological nature of the magnetic-vortex state gives rise to peculiar magnetization reversal observed in magnetic microdisks. Interestingly, magnetostatic and exchange, energies which, drive this reversal can be effectively controlled in artificial ferrimagnet heterostructures composed of rare-earth and transition metals. [Py(t)/Gd(t)]25 (t = 1 or 2 nm) superlattices demonstrate a pronounced change of the magnetization and exchange stiffness in a 10–300 K temperature range as well as very small magnetic anisotropy. Due to these properties, the magnetization of cylindrical microdisks composed of these artificial ferrimagnets can be transformed from the vortex to uniformly magnetized states in a permanent magnetic field by changing the temperature. We explored the behavior of magnetization in 1.5-μm [Py(t)/Gd(t)]25 (t = 1 or 2 nm) disks at different temperatures and magnetic fields and observed that due to the energy barrier separating vortex and uniformly magnetized states, the vortex nucleation and annihilation occur at different temperatures. This causes the temperature dependences of the magnetization in these Py/Gd disks to demonstrate a unique hysteretic behavior in a narrow temperature range. It was discovered that for the [Py(2 nm)/Gd(2 nm)]25 microdisks, the vortex can be metastable within a certain temperature range.
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subjects CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Disks
Ferrimagnetism
Ferrimagnets
Gadolinium
Heterostructures
Magnetic anisotropy
Magnetic fields
Magnetic properties
Magnetization reversal
Nucleation
Rare earth elements
Stiffness
Superlattices
Temperature
Transition metals
Vortices
title Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks
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