论文标题
使用He $^+$ ion iradiation控制Ni/Fe多层的磁弹性耦合
Control of magnetoelastic coupling in Ni/Fe multilayers using He$^+$ ion irradiation
论文作者
论文摘要
这项研究报告了后增长后的$^+$ iradiation对$ Ni $ /$ Fe $多层堆栈的磁弹性属性的影响。由He $^+$辐照在多层界面上引起的渐进性中混合使我们能够随着He $^+$ fluences的增加而调整饱和磁磁值值，甚至可以引起磁曲折效应的迹象。此外，确定了磁盘绝对值的临界通量大大减少。因此，由于许多应用所需的要求，几乎达到了对磁堆的应变的不敏感性。上述所有效果都归因于溅射Ni，Fe层的负饱和磁磁体的组合以及Ni $ _ {x} $ fe $ _ {1-X} $ y ni $ _ {x} $ _ {1-x} $的正面磁截图，其互过程中的所有含量会逐渐增加。重要的是，辐照不会改变层多晶结构，证实了后增长He $^+$ $离子辐照是调整磁性样品的磁弹性特性的绝佳工具。可以使用能够使用离子诱导的“磁性图案”来任意改变磁截图的材料处理来设想新的Spintronic设备。
This study reports the effects of post-growth He$^+$ 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, Fe layers and the positive magnetostriction of the Ni$_{x}$Fe$_{1-x}$ alloy at the intermixed interfaces, whose contribution is gradually increased with irradiation. Importantly the irradiation does not alter the layers polycrystalline structure, confirming that post-growth He$^+$ ion irradiation is an excellent tool to tune the magneto-elastic properties of magnetic samples. A new class of spintronic devices can be envisioned with a material treatment able to arbitrarily change the magnetostriction with ion-induced "magnetic patterning".
