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Epitaxial strain-engineered self-assembly of magnetic nanostructures in FeRh thin films

Witte, Ralf and Kruk, Robert and Molinari, Alan and Wang, Di and Schlabach, Sabine and Brand, Richard A and Provenzano, Virgil and Hahn, Horst (2016):
Epitaxial strain-engineered self-assembly of magnetic nanostructures in FeRh thin films.
50, In: Journal of Physics D: Applied Physics, (2), IOP Publishing, England, pp. 025007, ISSN 0022-3727, DOI: 10.1088/1361-6463/50/2/025007,
[Online-Edition: https://doi.org/10.1088/1361-6463/50/2/025007],
[Article]

Abstract

In this paper we introduce an innovative bottom-\up approach for engineering self-\assembled magnetic nanostructures using epitaxial strain-\induced twinning and phase separation. X-\ray diffraction, Fe-57 Mossbauer spectroscopy, scanning tunneling microscopy, and transmission electron microscopy show that epitaxial films of a near-\equiatomic FeRh alloy respond to the applied epitaxial strain by laterally splitting into two structural phases on the nanometer length scale. Most importantly, these two structural phases differ with respect to their magnetic properties, one being paramagnetic and the other ferromagnetic, thus leading to the formation of a patterned magnetic nanostructure. It is argued that the phase separation directly results from the different strain-\dependence of the total energy of the two competing phases. This straightforward relation directly enables further tailoring and optimization of the nanostructures' properties.

Item Type: Article
Erschienen: 2016
Creators: Witte, Ralf and Kruk, Robert and Molinari, Alan and Wang, Di and Schlabach, Sabine and Brand, Richard A and Provenzano, Virgil and Hahn, Horst
Title: Epitaxial strain-engineered self-assembly of magnetic nanostructures in FeRh thin films
Language: English
Abstract:

In this paper we introduce an innovative bottom-\up approach for engineering self-\assembled magnetic nanostructures using epitaxial strain-\induced twinning and phase separation. X-\ray diffraction, Fe-57 Mossbauer spectroscopy, scanning tunneling microscopy, and transmission electron microscopy show that epitaxial films of a near-\equiatomic FeRh alloy respond to the applied epitaxial strain by laterally splitting into two structural phases on the nanometer length scale. Most importantly, these two structural phases differ with respect to their magnetic properties, one being paramagnetic and the other ferromagnetic, thus leading to the formation of a patterned magnetic nanostructure. It is argued that the phase separation directly results from the different strain-\dependence of the total energy of the two competing phases. This straightforward relation directly enables further tailoring and optimization of the nanostructures' properties.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume: 50
Number: 2
Publisher: IOP Publishing, England
Uncontrolled Keywords: magnetic nanostructure, self-assembly, strain-adaption, epitaxy, FeRh
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 27 Jul 2017 08:55
DOI: 10.1088/1361-6463/50/2/025007
Official URL: https://doi.org/10.1088/1361-6463/50/2/025007
Funders: The authors acknowledge funding by the Deutsche Forschungsgemeinschaft via HA1344/28-1.
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