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Crystal structure and magnetic properties of hard magnetic Sm2Fe17Nδ thin films with Co substitution

Peng, L. and Yang, Q.H. and Zhang, H.W. and Song, Y.Q. and Shen, J. (2009) Crystal structure and magnetic properties of hard magnetic Sm2Fe17Nδ thin films with Co substitution. Journal of Magnetism and Magnetic Materials, 321 . pp. 442-445.

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Abstract

The crystalstructureandmagneticpropertiesofthehardmagneticSm2(Fe1xCox)17Nd thin films preparedbydcmagnetronsputteringandsubsequentnitrogenationprocesswereinvestigated.Itis foundthattheNcontentandcrystalstructuredeterminethenon-monotonicdependenceofthe coercivity HC on nitridingtemperatureforthefilmswith x ¼ 0. Withnitridingtemperatureexceeding 300 1C, NatomscanentertheSm2Fe17 phase andtheNcontentincreaseswithincreasingnitriding temperature,whichleadstoanincreasedcoercivity.However,themaximumvalueofthe HC is observed at 400 1C. The a-Fe softphaseappearswithnitridingtemperaturefurtherincreasingto500 1C, whichis responsible forthedecreased HC. When x is between0and0.36,thefilmsexhibitsingleTh2Zn17-type structure. Coatomsarefoundtogointothelatticeofthe2:17phase,generatinganenhancedexchange couplinginteractionbetweenthenano-grains,whichisresponsiblefortheimprovedhardmagnetic properties ofthefilmswithCosubstitutionatacertainrange.Especially,theoptimalvalueofthe coercivity HC and remanenceratio MR/MS reaches 4.0kOeand0.70forthefilmswith x ¼ 0.17and0.36, respectively.

Item Type:Article
Subjects:Material Science > Nanostructured materials
ID Code:4571
Deposited By:CSMNT
Deposited On:08 Apr 2009 03:52
Last Modified:08 Apr 2009 03:52

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