| 不同F含量导致星形Co(OH)F纳米晶体的磁性变化 |
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| 引用本文： | 胡杰,马凤仓,李文献,刘新宽,李伟,刘平. 不同F含量导致星形Co(OH)F纳米晶体的磁性变化[J]. 功能材料, 2019, 50(8): 8027-8031 |
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| 作者姓名： | 胡杰 马凤仓 李文献 刘新宽 李伟 刘平 |
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| 作者单位： | 上海理工大学 材料科学与工程学院,上海,200093;上海大学 材料科学与工程学院,上海,200444 |
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| 基金项目： | 国家自然科学基金;上海市自然科学基金 |
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| 摘 要： | 采用水热法制备氢氧化钴氟化物,通过控制反应物NH4F的量,改变Co(OH)F中F含量,从而研究不同F含量对氢氧化钴氟化物磁性行为的影响。X射线粉末衍射结果表明,合成样品为氢氧化钴氟化物。还发现,Co(OH)F在40 K下经历了反铁磁转变,在低于4 K的温度下,观察到的磁性重新排序为自旋玻璃现象。在场冷却过程之后发现Co(OH)F中出现交换偏置行为,并有F含量高的样品具有更强的交换偏置行为,分析后认为,这是由于晶体的变形导致表面出现旋转玻璃行为引起的。
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| 关 键 词： | Co(OH)F 磁化率 交换偏置 反铁磁性 氟掺杂 自旋玻璃 |
Magnetic property changes of Co(OH)F nanocrystals induced by F-doping |
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| HU Jie,MA Fengcang,LI Wenxian,LIU Xinkuan,LI Wei,LIU Ping. Magnetic property changes of Co(OH)F nanocrystals induced by F-doping[J]. Journal of Functional Materials, 2019, 50(8): 8027-8031 |
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| Authors: | HU Jie MA Fengcang LI Wenxian LIU Xinkuan LI Wei LIU Ping |
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| Affiliation: | (School of Materials Science and Engineering , University of Shanghai for Science and Technology , Shanghai 200093 , China;School of Materials Science and Engineering , Shanghai University , Shanghai 200444 , China) |
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| Abstract: | Cobalt hydroxide fluoride was obtained by a simple hydrothermal method.The content of F in Co ( OH ) F was changed to study the effect of different F content on the magnetic behavior by controlling the a - mount of reactant NH 4 F.The samples were determined as cobalt hydroxide fluoride from X - ray powder diffrac - tion data.Co ( OH ) F was found to undergo an antiferromagnetic transition at 4K.Furthermore , at temperatures below 4K , the observed magnetic reordering is a spin glass phenomenon.After the field cooling process , the exchange bias behavior appeared in Co ( OH ) F , and the sample with high F content had stronger exchange bias behavior , resulting from the deformation of the crystal and the spin glass behavior on the surface. |
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| Keywords: | Co ( OH ) F magnetic susceptibility exchange bias antiferromagnetism fluorine doping spin glass |
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