Abstract Heavy metals like Pt play an important role in the field of spintronics due to their high spin-orbit coupling. Yet optimization condition for using it in proximity to magnetic materials is still challenging. In this letter, using post-annealing of permalloy (Py)/Pt multilayers, different composition structures of Pt with Py have been fabricated. Structural analysis showed that at temperatures higher than 200 °C the Pt diffuses into the crystal structure of Py while at lower temperatures Pt is in proximity to the Py layer. At annealing temperatures below 200 °C the magnetoresistance (MR) ratio and sensitivity increases and at higher annealing temperatures the MR ratio and sensitivity decreases. Magnetic hysteresis loop measurement showed that at lower annealing temperature, magnetic moment and therefore MR ratio increases. Results can be considered for optimization of heavy metal mixing with magnetic materials for magnetic field sensor enhancement.

中文翻译：

---

用磁性薄膜优化用于磁场传感器应用的 Pt 成分

摘要 Pt 等重金属由于其高自旋轨道耦合在自旋电子学领域发挥着重要作用。然而，在磁性材料附近使用它的优化条件仍然具有挑战性。在这封信中，使用坡莫合金 (Py)/Pt 多层膜的后退火，已制造出 Pt 与 Py 的不同组成结构。结构分析表明，在高于 200 °C 的温度下，Pt 扩散到 Py 的晶体结构中，而在较低温度下，Pt 靠近 Py 层。在低于 200 °C 的退火温度下，磁阻 (MR) 比和灵敏度会增加，而在更高的退火温度下，磁阻 (MR) 比和灵敏度会降低。磁滞回线测量表明，在较低的退火温度下，磁矩增加，因此 MR 比增加。