Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks

Lapa, Pavel N.; Ding, Junjia; Phatak, Charudatta; Pearson, John E.; Jiang, J. S.; Hoffmann, Axel; Novosad, Valentine

doi:10.1063/1.4999089

Title: Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks

Journal Article · Mon Aug 28 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4999089· OSTI ID:1393542

Lapa, Pavel N. ^[1];

^[2];

^[2]; Pearson, John E. ^[2]; Jiang, J. S. ^[2];

^[2]; Novosad, Valentine ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Div.; Texas A & M Univ., College Station, TX (United States). Dept. of Physics and Astronomy
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Div.

The topological nature of 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 Py/Gd disks magnetization to demonstrate 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 at a certain temperature range.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1393542

Alternate ID(s):: OSTI ID: 1376738

Journal Information:: Journal of Applied Physics, Vol. 122, Issue 8; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Effects of nanodots shape and lattice constants on the spin wave dynamics of patterned permalloy dots Porwal, Nikita; Sinha, Jaivardhan; Datta, Prasanta Kumar AIP Advances, Vol. 9, Issue 1 https://doi.org/10.1063/1.5066268	journal	January 2019
Bistability of magnetic states in Fe-Pd nanocap arrays Aravind, P. B.; Heigl, M.; Fix, M. Nanotechnology, Vol. 30, Issue 40 https://doi.org/10.1088/1361-6528/ab2d7f	journal	July 2019

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