Control of magnetoelastic coupling in Ni/Fe multilayers using He+ion irradiation

Masciocchi G, Van Der Jagt JW, Syskaki MA, Lamperti A, Wolff N, Lotnyk A, Langer J, Kienle L, Jakob G, Borie B, Kehlberger A, Ravelosona D, Klaeui M (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Applied Physics Letters American Institute of Physics (AIP)

Book Volume: 121

Article Number: 182401

Journal Issue: 18

DOI: 10.1063/5.0107942

Abstract

This study reports the effects of post-growth He+ irradiation on the magneto-elastic properties of a Ni/Fe multi-layered stack. The progressive intermixing caused by He+ irradiation at the interfaces of the multilayer allows us to tune the saturation magnetostriction value with increasing He+ fluences and even to induce a reversal of the sign of the magnetostrictive effect. Additionally, the critical fluence at which the absolute value of the magnetostriction is dramatically reduced is identified. Therefore, insensitivity to strain of the magnetic stack is nearly reached, as required for many applications. All the above-mentioned effects are attributed to the combination of the negative saturation magnetostriction of sputtered Ni and Fe layers and the positive magnetostriction of the NixFe1-x alloy at the intermixed interfaces, whose contribution is gradually increased with irradiation. Importantly, the irradiation does not alter the layer polycrystalline structure, confirming that post-growth He+ ion irradiation is an excellent tool to tune the magneto-elastic properties of multilayer samples. An alternative class of spintronic devices can be envisioned with a material treatment able to arbitrary change the magnetostriction with ion-induced "magnetic patterning".

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Spin-Ion Technologies FR France (FR) Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy IT Italy (IT) Christian-Albrechts-Universität zu Kiel DE Germany (DE) Leibniz-Institute für Oberflächenmodifizierung e. V. (IOM) / Leibniz Institute of Surface Modification DE Germany (DE) Singulus Technologies AG DE Germany (DE) Sensitec GmbH DE Germany (DE)

How to cite

APA:

Masciocchi, G., Van Der Jagt, J.W., Syskaki, M.-A., Lamperti, A., Wolff, N., Lotnyk, A.,... Klaeui, M. (2022). Control of magnetoelastic coupling in Ni/Fe multilayers using He+ion irradiation. Applied Physics Letters, 121(18). https://dx.doi.org/10.1063/5.0107942

MLA:

Masciocchi, Giovanni, et al. "Control of magnetoelastic coupling in Ni/Fe multilayers using He+ion irradiation." Applied Physics Letters 121.18 (2022).

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