| 包钴型γ-Fe2O3磁粉矫顽力的研究 |
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| 引用本文： | 罗河烈,孙克,冯远冰,龚伟,章志英. 包钴型γ-Fe2O3磁粉矫顽力的研究[J]. 物理学报, 1981, 30(5): 642-649 |
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| 作者姓名： | 罗河烈 孙克 冯远冰 龚伟 章志英 |
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| 作者单位： | 中国科学院物理研究所;中国科学院物理研究所;中国科学院物理研究所;中国科学院物理研究所;中国科学院物理研究所 |
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| 摘 要： | 包钴型γ-Fe2O3磁粉分为包钴γ-Fe2O3(简记为Co-γ-Fe2O3)和包钴包亚铁γ-Fe2O3(简记为CoFe-γ-Fe2O3)两种,它们的矫顽力可比γ-Fe2O3磁粉的提高100至400Oe左右,本工作对这两种磁粉矫顽力增大的原因作了探讨,认为它们矫顽力增大的机制不同:CO-γ-Fe2O3矫顽力增大是由于表面包覆一层Co(OH)2使表面各向异性增大,而CoFe-γ-Fe2O3则是由于表面包覆的是钴铁氧体,γ-Fe2O3与钴铁氧体之间发生耦合作用,使矫顽力增大。
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| 收稿时间： | 1980-08-25 |
A STUDY ON THE COERCIVITY OF Co-ABSORBED γ-Fe2O3 POWDER |
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| LUO HE-LIE,SUN KE,FENG YAN-BIN,GONG WEI and ZHANG ZHI-YING. A STUDY ON THE COERCIVITY OF Co-ABSORBED γ-Fe2O3 POWDER[J]. Acta Physica Sinica, 1981, 30(5): 642-649 |
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| Authors: | LUO HE-LIE SUN KE FENG YAN-BIN GONG WEI ZHANG ZHI-YING |
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| Abstract: | Co-absorbed γ-Fe2O3 magnetic powder is divided into two sorts: Co-doped γ-Fe2O3 (known as Co-γ-Fe2O3) and Co-ferrite epitaxial γ-Fe2O3 (known as CoFe-γ-Fe2O3). The coercivity of Co-absorbed γ-Fe2O3 is 100 to 400 (Oe) greater than the coercivity of γ-Fe2O3.The causes of the increasing coercivity of Co-absorbed γ-Fe2O3 were studied. The mechanism of increasing coercivity is different between the two sorts of powder: Co (OH)2 formed on the surface of γ-Fe2O3 raised its surface anisotrpy and the coercivity of Co-γ-Fe2O3 is increased. The cause of increasing coercivity of CoFe-γ-Fe2O3 is the coupling effect between the Co-ferrite epitaxial layer and γ-Fe2O3. |
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