论文标题
通过现场冷却在交换耦合的铁磁体中塑造纳米级磁性域记忆
Shaping nanoscale magnetic domain memory in exchange-coupled ferromagnets by field cooling
论文作者
论文摘要
磁性纳米技术的发展取决于对材料中纳米级磁性机制的详细了解。磁性域记忆（MDM），即，在磁场循环期间重复相同模式的趋势对于包括磁记录开发在内的许多技术都很重要。我们显示了连贯的X射线磁散射研究在[CO/PD]/IRMN膜中揭示了MDM。当用相干X射线照亮时，[CO/PD]多层的磁域会产生其特定纳米级构型独有的斑点图案。通过在整个磁化循环中交叉相关的这种斑点模式，我们测量了MDM。当冷却在其阻塞温度以下时，该薄膜的表现高达100％MDM，这是由与IRMN层的交换耦合引起的。此外，MDM的程度在很大程度上取决于冷却条件。如果膜在中等磁场下冷却，则MDM在整个磁化回路中都很高。如果在几乎饱和的场下冷却膜，则MDM消失，除非成核和饱和
The advance of magnetic nanotechnologies relies on detailed understanding of nanoscale magnetic mechanisms in materials. Magnetic domain memory (MDM), i.e., the tendency for magnetic domains to repeat the same pattern during field-cycling, is important to many technologies including magnetic recording developments. We show coherent x-ray magnetic scattering studies unveiling MDM in [Co/Pd]/IrMn films. When illuminated by coherent x-rays, the magnetic domains in the [Co/Pd] multilayer produce a speckle pattern unique to their specific nanoscale configuration. By cross-correlating such speckle patterns throughout the magnetization loop, we measure the MDM. When cooled below its blocking temperature, the film exhibits up to 100% MDM, induced by exchange-couplings with the IrMn layer. Furthermore, the degree of MDM drastically depends on cooling conditions. If the film is cooled under moderate fields, MDM is high throughout the entire magnetization loop. If the film is cooled under nearly saturating field, MDM vanishes, except at nucleation and saturation
