Fe_CoO(111)磁性表征数据集

本项目研究了 (111) 取向的反铁磁 CoO 薄膜表面粗糙度对表面生长的铁磁性Fe交换偏置效应的影响。通过改变 CoO 薄膜的层厚，表面粗糙度在原子尺度上控制在 ~0.35 nm 以下的范围内。可以观察到，交换偏置场 (HE ) 和矫顽力 ( HC ) 都很大程度上取决于 CoO (111) 在与 Fe 薄膜界面处原子级的粗糙度。发现了 H E 和 H C 对界面粗糙度的相反依赖性，这归因于由完全未补偿的 CoO（111）表面处的原子粗糙度引起的部分补偿自旋态，并使用蒙特卡罗模拟证实了这一点。此外，发现 HC 的起始温度比阻断温度 ( TB ) 低约 80 K，并且 HC 的温度依赖性遵循幂指数规律，临界指数等于 1，这表明在该系统中， HC比 HE 更多的是与界面相关的属性。

This project investigates the effect of surface roughness of (111)-oriented antiferromagnetic CoO thin films on the exchange bias effect of ferromagnetic Fe grown on their surfaces. By varying the layer thickness of CoO thin films, the surface roughness is controlled at the atomic scale to a range below ~0.35 nm. It can be observed that both the exchange bias field (HE) and coercivity (HC) largely depend on the atomic-level roughness of CoO (111) at the interface with Fe thin films. An opposite dependence of HE and HC on interface roughness is discovered, which is attributed to partially compensated spin states induced by atomic roughness at the fully uncompensated CoO (111) surface, and this is confirmed by Monte Carlo simulations. In addition, the onset temperature of HC is found to be approximately 80 K lower than the blocking temperature (TB), and the temperature dependence of HC follows a power-law behavior with a critical exponent equal to 1, which indicates that in this system, HC is more of an interface-related property than HE.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于反铁磁CoO薄膜表面粗糙度对铁磁性Fe交换偏置效应的研究，通过控制CoO薄膜层厚在原子尺度调节粗糙度，揭示了交换偏置场和矫顽力对界面粗糙度的相反依赖性，并利用蒙特卡罗模拟验证了部分补偿自旋态的影响。数据集包含118个文件，总数据量4.33MB，由北京大学创建，属于凝聚态物理学领域，支撑国家重点研发计划项目。