Thermal nanoconversion of ferromagnetic nanoislands

In this work, we investigate the use of post-fabrication thermal nanoconversion (TNC), using a heated scanning probe tip, to modify the magnetic properties of Ni80Fe20 elliptical nanoislands with varying aspect ratio. Despite Ni80Fe20 being unoptimized for TNC, by comparing quasistatic and dynamic m...

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Bibliographic Details
Published in:Applied physics letters 2024-03, Vol.124 (11)
Main Authors: Barker, O. J., Mohammadi-Motlagh, A., Wright, A. J., Batty, R., Finch, H., Vezzoli, A., Keatley, P. S., O'Brien, L.
Format: Article
Language:English
Subjects:
Aspect ratio
Ferromagnetism
Kerr magnetooptical effect
Magnetic properties
Magnetic saturation
Thin films
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Summary:In this work, we investigate the use of post-fabrication thermal nanoconversion (TNC), using a heated scanning probe tip, to modify the magnetic properties of Ni80Fe20 elliptical nanoislands with varying aspect ratio. Despite Ni80Fe20 being unoptimized for TNC, by comparing quasistatic and dynamic magneto-optical Kerr effect microscopy measurements, we demonstrate that TNC at a contact temperature of 250 °C increases the saturation magnetization of the treated nanoislands, reaching a value close to 800 kA/m. Micromagnetic simulations of the nanoislands indicate that the TNC technique can be used to alter the remanent state, from a single domain to a vortex. These results demonstrate the opportunities afforded by TNC to modify the properties of selected areas in a thin film or a patterned sample, particularly when designing magnonic crystals and other nanomagnetic devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0189759