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Article: Microstructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing

TitleMicrostructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing
Authors
Issue Date2010
PublisherInstitute of Pure and Applied Physics. The Journal's web site is located at http://www.ipap.jp/jjap/index.htm
Citation
Japanese Journal Of Applied Physics, 2010, v. 49 n. 12, article no. 123001 How to Cite?
AbstractThe effects of the fabrication methods and different capped oxide (SiO 2 and TiO 2) layers on the microstructure and magnetism of FePt thin films were studied. Both structural ordering (S ∼ 0:7) from the fcc FePt phase to the fct FePt phase and magnetic hardening were observed in the annealed FePt/SiO 2 thin films with a low substrate rotation speed (S r=1 rpm). However, only the annealed FePt/SiO 2 thin films prepared with a high S r (10 rpm) exhibited isolated FePt grains separated by the grain boundary SiO 2, as revealed by transmission electron microscopy and magnetometry. Furthermore, similar results in microstructures and magnetic properties were obtained after replacing the capped layer with TiO 2. However, an enhanced order parameter (S ∼ 0:85) and a smaller FePt grain size (∼6:8 nm), which are promising characteristics for ultrahighdensity magnetic recording, were achieved in the annealed FePt/TiO 2 thin films; however, the annealed FePt/SiO 2 thin films exhibited a larger grain size (∼15 nm). This indicates that TiO 2 inhibits the grain growth of FePt more effectively than SiO 2. © 2010 The Japan Society of Applied Physics.
Persistent Identifierhttp://hdl.handle.net/10722/124694
ISSN
2015 Impact Factor: 1.122
2015 SCImago Journal Rankings: 0.258
ISI Accession Number ID
Funding AgencyGrant Number
Ministry of Economic Affairs of Taiwan99-EC-17-A-08-S1-006
Seed Funding for Basic Research of the University of Hong Kong
Funding Information:

This work was supported by the Ministry of Economic Affairs of Taiwan (99-EC-17-A-08-S1-006) and by the Seed Funding for Basic Research of the University of Hong Kong.

References

 

DC FieldValueLanguage
dc.contributor.authorSun, ACen_HK
dc.contributor.authorHsu, HFen_HK
dc.contributor.authorWu, YJen_HK
dc.contributor.authorChiu, YiLen_HK
dc.contributor.authorHsu, JHen_HK
dc.contributor.authorPong, PWTen_HK
dc.contributor.authorSuzuki, Ten_HK
dc.contributor.authorLin, KWen_HK
dc.date.accessioned2010-10-31T10:48:54Z-
dc.date.available2010-10-31T10:48:54Z-
dc.date.issued2010en_HK
dc.identifier.citationJapanese Journal Of Applied Physics, 2010, v. 49 n. 12, article no. 123001en_HK
dc.identifier.issn0021-4922en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124694-
dc.description.abstractThe effects of the fabrication methods and different capped oxide (SiO 2 and TiO 2) layers on the microstructure and magnetism of FePt thin films were studied. Both structural ordering (S ∼ 0:7) from the fcc FePt phase to the fct FePt phase and magnetic hardening were observed in the annealed FePt/SiO 2 thin films with a low substrate rotation speed (S r=1 rpm). However, only the annealed FePt/SiO 2 thin films prepared with a high S r (10 rpm) exhibited isolated FePt grains separated by the grain boundary SiO 2, as revealed by transmission electron microscopy and magnetometry. Furthermore, similar results in microstructures and magnetic properties were obtained after replacing the capped layer with TiO 2. However, an enhanced order parameter (S ∼ 0:85) and a smaller FePt grain size (∼6:8 nm), which are promising characteristics for ultrahighdensity magnetic recording, were achieved in the annealed FePt/TiO 2 thin films; however, the annealed FePt/SiO 2 thin films exhibited a larger grain size (∼15 nm). This indicates that TiO 2 inhibits the grain growth of FePt more effectively than SiO 2. © 2010 The Japan Society of Applied Physics.en_HK
dc.languageengen_HK
dc.publisherInstitute of Pure and Applied Physics. The Journal's web site is located at http://www.ipap.jp/jjap/index.htmen_HK
dc.relation.ispartofJapanese Journal of Applied Physicsen_HK
dc.titleMicrostructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealingen_HK
dc.typeArticleen_HK
dc.identifier.emailPong, PWT:ppong@eee.hku.hken_HK
dc.identifier.authorityPong, PWT=rp00217en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1143/JJAP.49.123001en_HK
dc.identifier.scopuseid_2-s2.0-79551638422en_HK
dc.identifier.hkuros176314en_HK
dc.identifier.hkuros176497-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79551638422&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume49en_HK
dc.identifier.issue12en_HK
dc.identifier.spagearticle no. 123001-
dc.identifier.epagearticle no. 123001-
dc.identifier.isiWOS:000285632400040-
dc.publisher.placeJapanen_HK
dc.identifier.scopusauthoridSun, AC=8141402400en_HK
dc.identifier.scopusauthoridHsu, HF=26537502100en_HK
dc.identifier.scopusauthoridWu, YJ=36988985200en_HK
dc.identifier.scopusauthoridChiu, YiL=35253456100en_HK
dc.identifier.scopusauthoridHsu, JH=7402284145en_HK
dc.identifier.scopusauthoridPong, PWT=24071267900en_HK
dc.identifier.scopusauthoridSuzuki, T=35254540500en_HK
dc.identifier.scopusauthoridLin, KW=7403967959en_HK

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