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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 …
AIP Publishing LLC
Publication date: 
31 Oct 2022

Giovanni Masciocchi, Johannes Wilhelmus van der Jagt, M-A Syskaki, Alessio Lamperti, Niklas Wolff, Andriy Lotnyk, Jürgen Langer, Lorenz Kienle, Gerhard Jakob, Benjamin Borie, Andreas Kehlberger, Dafine Ravelosona, Mathias Kläui

Biblio References: 
Volume: 121 Issue: 18 Pages: 182401
Applied Physics Letters