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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Anisotropy-axis orientation effect on the magnetization of γ-Fe _2O_3 frozen ferrofluid
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Anisotropy-axis orientation effect on the magnetization of γ-Fe _2O_3 frozen ferrofluid

机译：各向异性轴取向对γ-Fe_2O_3冻结铁磁流体磁化的影响

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摘要

The effect of magnetic anisotropy-axis alignment on the superparamagnetic (SPM) and superspin glass (SSG) states in a frozen ferrofluid has been investigated. The ferrofluid studied here consists of maghemite nanoparticles (γ-Fe_2O_3, mean diameter = 8.6 nm) dispersed in glycerine at a volume fraction of ～15%. In the high temperature SPM state, the magnetization of aligned ferrofluid increased by a factor varying between 2 and 4 with respect to that in the randomly oriented state. The negative interaction energy obtained from the Curie-Weiss fit to the high temperature susceptibility in the SPM states as well as the SSG phase onset temperature determined from the linear magnetization curves were found to be rather insensitive to the anisotropy-axis alignment. The low temperature ageing behaviour, explored via 'zero-field cooled magnetization' relaxation measurements, however, shows a distinct difference in the ageing dynamics in the anisotropy-axis aligned and randomly oriented SSG states.
机译：研究了磁各向异性轴对准对冷冻铁磁流体中超顺磁性（SPM）和超旋转玻璃（SSG）状态的影响。此处研究的铁磁流体由分散在甘油中的磁赤铁矿纳米颗粒（γ-Fe_2O_3，平均直径= 8.6 nm）组成，体积分数约为15％。在高温SPM状态下，定向铁磁流体的磁化强度相对于随机取向状态下的磁化强度增加了2-4倍。发现居里-魏斯拟合得到的负相互作用能与SPM状态下的高温敏感性以及从线性磁化曲线确定的SSG相开始温度对各向异性轴排列不敏感。通过“零场冷却磁化”弛豫测量探索的低温老化行为，在各向异性轴排列和随机取向的SSG状态下显示出老化动力学的明显差异。

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