The efficient detection of a magnetic state at nanoscale dimensions is important for the development of spin-logic devices. Magnetoresistance effects can be used to detect magnetic states, but they do not generate an electromotive force (that is, a voltage) or a current that can be used to drive a circuit element for logic device applications. Here we report a favourable scaling law for the detection of an in-plane magnetic state of a magnet by using the inverse spin Hall effect in cobalt–iron/platinum (CoFe/Pt) nanostructured devices. By reducing the dimensions of the device, we obtain a large spin Hall signal of 0.3 Ω at room temperature and quantify an effective spin-to-charge conversion rate for the ferromagnetic/heavy metal system. We predict that this spin–orbit detection of magnetic states could be used to drive spin-logic circuits.

在纳米尺度上有效检测磁性状态对于自旋逻辑器件的开发很重要。磁阻效应可用于检测磁态，但它们不会产生电动势（即电压）或电流，该电动势或电流可用于驱动逻辑器件应用的电路元件。在这里，我们报告了在钴-铁/铂（CoFe / Pt）纳米结构器件中使用逆自旋霍尔效应来检测磁体的面内磁状态的有利定标律。通过减小器件的尺寸，我们在室温下获得了0.3Ω的大自旋霍尔信号，并量化了铁磁/重金属系统的有效自旋电荷转换率。我们预测，这种磁态的自旋轨道检测可用于驱动自旋逻辑电路。