Single-pulse all-optical switching in amorphous DyxCo1-x and TbxCo1-x
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Journal ArticleDate:
2022Access:
openAccessCitation:
Zexiang Hu, Jean Besbas, Ross Smith, Niclas Teichert, Gwenael Atcheson, Karsten Rode, Plamen Stamenov and J. M. D. Coey, Single-pulse all-optical switching in amorphous DyxCo1-x and TbxCo1-x, APPLIED PHYSICS LETTERS, 120, 2022, 112401-1 - 112401-6Download Item:
5.0077226.pdf (PDF) 2.137Mb
Abstract:
Repeated uniform switching of the magnetization of thin films of ferrimagnetic amorphous Gdx(FeCo)1−x in response to single fast laser pulses is well established. Here, we report unusual toggle switching in thin films of sperimagnetic amorphous DyxCo1−x and TbxCo1−x with x ≈ 0.25 irradiated with single 200 fs pulses of 800 nm laser light. The samples have strong local random anisotropy due to the non-S state rare earth. The compensation temperature of the films is ≤180 K, and their Curie temperature is ≈500 K. They are largely switched by the first pulse, and subsequent pulses lead to partial re-switching of a decreasing amount of the irradiated area, with a granular structure of submicrometer regions of switched and unswitched material. Individual switched regions about 700 nm in size are observed around the edge of the irradiated spots where the fluence is at the threshold for switching. Results are discussed in terms of a random anisotropy model where the ratio of local anisotropy to exchange is temperature dependent.
Sponsor
Grant Number
European Commission
17/NSFC/ 5294 MANIAC, and EU FET Open
Science Foundation Ireland (SFI)
16/IA/4534 ZEMS, 12/RC/2278 AMBER
Author's Homepage:
http://people.tcd.ie/venkatemhttp://people.tcd.ie/jcoey
Description:
PUBLISHED
Author: Venkatesan, Munuswamy; Coey, John
Sponsor:
European CommissionScience Foundation Ireland (SFI)
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Series/Report no:
APPLIED PHYSICS LETTERS;120;
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Full text availableSubject:
Ultrafast and Terahertz Spintronics, Femtosecond lasers, Thin films, Atomic force microscopy, Magnetic materials, Optical computing, Hall effect, Laser amplifiers, Ultrafast lasers, Phase transitions, Magnetic anisotropySubject (TCD):
Nanoscience & Materials , Magnetism and spin electronics , Nanotechnology , PhysicsDOI:
doi: 10.1063/5.0077226Source URI:
https://aip.scitation.org/doi/pdf/10.1063/5.0077226ISSN:
0003-6951The following license files are associated with this item: