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arXiv · 2006.10687

Flexible ferromagnetic nanowires with ultralow magnetostriction

Giuseppe Muscas·Petra E. Jönsson·I. G. Serrano·Örjan Vallin·M. Venkata Kamalakar
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Abstract

Integration of magneto-electric and spintronic sensors presents a massive potential for advancing flexible and wearable technology. Magnetic nanowires are core components for building such devices, and therefore it important to realize flexible magnetic nanowires and uncover magneto-elastic properties, which can propel not only such flexible sensing applications, but can also make new pathways for exploration of flexible magneto-plasmonic devices, and discovering unseen observations at reduced dimensions. Here, we realize ferromagnetic nanowires on flexible substrates for the first time. Through extensive magneto-optical Kerr experiments, exploring the Villari effect in such nanowires, we reveal a two-order of magnitude reduced magnetostrictive constant in nanowires, compared to bulk values. In addition, the nanowires exhibit a remarkably resilient behavior sustaining bending radii ~ 5 mm, very high endurance, and enhanced elastic limit compared to thin films of similar thickness and composition. We confirm the observed performance by micro-magnetic simulations and attribute the observations to the size reduction and high nanostructure-interfacial effects. The flexible magnetic nanowires with ultralow magnetostriction open up new opportunities for stable surface mountable and wearable spintronic sensors, enable a credible way for engineering advanced nanospintronic devices and exploring new effects in hybrid heterostructures.

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Giuseppe Muscas, Petra E. Jönsson, I. G. Serrano, Örjan Vallin, M. Venkata Kamalakar. 2020-06-18. Flexible ferromagnetic nanowires with ultralow magnetostriction. https://arxiv.org/abs/2006.10687

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