Abstract

The relaxation of the remanent magnetization of antiferromagnetically ordered ferrihydrite nanoparticles at the exchange bias effect implemented in these systems has been investigated. The magnetization relaxation depends logarithmically on time, which is typical of the thermally activated hoppings of particle magnetic moments through the potential barriers caused by the magnetic anisotropy. The barrier energy obtained by processing of the remanent magnetization relaxation data under the field cooling conditions significantly exceeds the barrier energy under standard (zero field cooling) conditions. The observed difference points out the possibility of using the remanent magnetization relaxation to analyze the mechanisms responsible for the exchange bias effect in antiferromagnetic nanoparticles and measure the parameters of the exchange coupling of magnetic subsystems in such objects.

中文翻译：

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以水铁矿为例的反铁磁性纳米粒子剩余磁化弛豫特性

摘要

已经研究了在这些系统中实现的交换偏置作用下反铁磁有序亚铁水合物纳米粒子的剩余磁化强度的松弛。磁化弛豫对数依赖于时间，这是粒子磁矩通过由磁各向异性引起的势垒的热激活跳跃的典型表现。通过在场冷却条件下处理剩余磁化弛豫数据而获得的势垒能量大大超过了标准（零场冷却）条件下的势垒能量。