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This study reports the effects of post-growth He$^+$ irradiation on themagneto-elastic properties of a $Ni$ /$Fe$ multi-layered stack. The progressiveintermixing caused by He$^+$ irradiation at the interfaces of the multilayerallows us to tune the saturation magnetostriction value with increasing He$^+$fluences, and even to induce a reversal of the sign of the magnetostrictiveeffect. Additionally, the critical fluence at which the absolute value of themagnetostriction is dramatically reduced is identified. Therefore insensitivityto strain of the magnetic stack is nearly reached, as required for manyapplications. All the above mentioned effects are attributed to the combinationof the negative saturation magnetostriction of sputtered Ni, Fe layers and thepositive magnetostriction of the Ni$_{x}$Fe$_{1-x}$ alloy at the intermixedinterfaces, whose contribution is gradually increased with irradiation.Importantly the irradiation does not alter the layers polycrystallinestructure, confirming that post-growth He$^+$ ion irradiation is an excellenttool to tune the magneto-elastic properties of magnetic samples. A new class ofspintronic devices can be envisioned with a material treatment able toarbitrarily change the magnetostriction with ion-induced "magnetic patterning".

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