Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks
Abstract
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.
- Authors:
-
[2];
[2];
[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.
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1393542
- Alternate Identifier(s):
- OSTI ID: 1376738
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 8; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Lapa, Pavel N., Ding, Junjia, Phatak, Charudatta, Pearson, John E., Jiang, J. S., Hoffmann, Axel, and Novosad, Valentine. Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks. United States: N. p., 2017.
Web. doi:10.1063/1.4999089.
Lapa, Pavel N., Ding, Junjia, Phatak, Charudatta, Pearson, John E., Jiang, J. S., Hoffmann, Axel, & Novosad, Valentine. Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks. United States. https://doi.org/10.1063/1.4999089
Lapa, Pavel N., Ding, Junjia, Phatak, Charudatta, Pearson, John E., Jiang, J. S., Hoffmann, Axel, and Novosad, Valentine. Mon .
"Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks". United States. https://doi.org/10.1063/1.4999089. https://www.osti.gov/servlets/purl/1393542.
@article{osti_1393542,
title = {Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks},
author = {Lapa, Pavel N. and Ding, Junjia and Phatak, Charudatta and Pearson, John E. and Jiang, J. S. and Hoffmann, Axel and Novosad, Valentine},
abstractNote = {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.},
doi = {10.1063/1.4999089},
journal = {Journal of Applied Physics},
number = 8,
volume = 122,
place = {United States},
year = {Mon Aug 28 00:00:00 EDT 2017},
month = {Mon Aug 28 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
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