Superparamagnetic relaxation of Fe deposited on MgO(001).
Superparamagnetic relaxation of Fe deposited on MgO(001).
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沉积在 MgO(001) 上的 Fe 的超顺磁弛豫。
DOI：
10.1103/physrevb.52.12779
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Báder
中科院分区：
文献类型：
--
作者：
Park;Adenwalla;Felcher;Báder
本文研究了700 K下在MgO（001）上生长的Fe的超顺磁性行为，其厚度相当于10个单层膜的厚度。由200埃的MgO存款分隔的两个这样的Fe存款表现出铁磁响应，在300或150 K下没有磁滞，但具有相同的约化磁化曲线{italM}（{italH}/{italT}），这证实了超顺磁性的存在。{ital将300 K下的{M}（{ital H}）数据拟合为朗之万函数以产生直径的平均粒度。{ital场冷和零场冷样品的M}（{italT}）表现出具有粒径分布的超顺磁性颗粒的行为特征。在不同温度下测量的20小时内随时间变化的rebirth磁化强度数据显示非指数衰减归因于颗粒尺寸和颗粒之间的相互作用的分布。
Superparamagnetic behavior is investigated for Fe grown at 700 K onto MgO(001) to a thickness equivalent to that of a ten monolayer film. Two such Fe deposits separated by a 200-A deposit of MgO exhibit a ferromagnetic response with no hysteresis at either 300 or 150 K, but with identical reduced magnetization curves {ital M}({ital H}/{ital T}) which confirms the existence of superparamagnetism. {ital M}({ital H}) data at 300 K were fitted to a Langevin function to yield an average particle size of 100 A diameter. {ital M}({ital T}) for field-cooled and zero-field-cooled samples shows behavior characteristic of superparamagnetic particles with a distribution in particle size. Time-dependent remanent magnetization data measured over a 20 h period at various temperatures show nonexponential decay attributed to the distribution in particle size and interactions among the particles.