Finite size effects on the ultrafast remagnetization dynamics of FePt

We investigate the ultrafast magnetization dynamics of FePt in the L10 phase after an optical heating pulse, as used in heat assisted magnetic recording. We compare continuous and nanogranular thin films and emphasize the impact of the finite size on the remagnetization dynamics. The remagnetization...

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Bibliographic Details
Published inarXiv.org
Main Authors Willig, L, A von Reppert, Deb, M, Ganss, F, Hellwig, O, Bargheer, M
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 03.10.2019
Subjects
Domain walls
Dynamics
Intermetallic compounds
Iron compounds
Magnetic fields
Magnetic materials
Magnetic properties
Magnetic recording
Magnetism
Physics - Materials Science
Physics - Mesoscale and Nanoscale Physics
Platinum compounds
Size effects
Thin films
Transport properties
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Summary:We investigate the ultrafast magnetization dynamics of FePt in the L10 phase after an optical heating pulse, as used in heat assisted magnetic recording. We compare continuous and nanogranular thin films and emphasize the impact of the finite size on the remagnetization dynamics. The remagnetization speeds up significantly with increasing external magnetic field only for the continuous film, where domain wall motion governs the dynamics. The ultrafast remagnetization dynamics in the continuous film are only dominated by heat transport in the regime of high magnetic fields, whereas the timescale required for cooling is prevalent in the granular film for all magnetic field strengths. These findings highlight the necessary conditions for studying the intrinsic heat transport properties in magnetic materials.
ISSN:2331-8422
DOI:10.48550/arxiv.1910.01413