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Issue 16, 2019
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Selective and fast plasmon-assisted photo-heating of nanomagnets

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Abstract

Thermal relaxation of nanoscale magnetic islands, mimicking Ising macrospins, is indispensable for studies of geometrically frustrated artificial spin systems and low-energy nanomagnetic computation. Currently-used heating schemes based on contact to a thermal reservoir, however, lack the speed and spatial selectivity required for the implementation in technological applications. Applying a hybrid approach by combining a plasmonic nanoheater with a magnetic element, in this work we establish the robust and reliable control of local temperatures in nanomagnetic arrays by contactless optical means. Plasmon-assisted photo-heating allows for temperature increases of up to several hundred kelvins, which lead to thermally-activated moment reversals and a pronounced reduction of the magnetic coercive field. Furthermore, the polarization-dependent absorption cross section of elongated plasmonic elements enables sublattice-specific heating on sub-nanosecond time scales. Using optical degrees of freedom, i.e. focal position, polarization, power, and pulse length, thermoplasmonic heating of nanomagnets offers itself for the use in flexible, fast, spatially-, and element-selective thermalization for functional magnetic metamaterials.

Graphical abstract: Selective and fast plasmon-assisted photo-heating of nanomagnets

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Article information


Submitted
22 Feb 2019
Accepted
01 Apr 2019
First published
01 Apr 2019

Nanoscale, 2019,11, 7656-7666
Article type
Paper

Selective and fast plasmon-assisted photo-heating of nanomagnets

M. Pancaldi, N. Leo and P. Vavassori, Nanoscale, 2019, 11, 7656
DOI: 10.1039/C9NR01628G

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