Effects of B additions in FePt and FePt:C films

B was co-sputtered with FePt films, leading to a granular structure; however, in addition to segregating at grain boundaries, local bonding of Fe-B was formed, which suppressed the ordering of FePt and thus degraded the perpendicular anisotropy. A boron capping layer was deposited on FePt:C (28 vol....

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Veröffentlicht in:	Journal of applied physics 2014-05, Vol.115 (17), p.17
Hauptverfasser:	Chiu, Jin-Chun, Wen, Wei-Chih, Wang, Liang-Wei, Wang, Ding-Shuo, Lai, Chih-Huang
Format:	Artikel
Sprache:	eng
Schlagworte:	ANISOTROPY ANNEALING BORON COERCIVE FORCE Coercivity CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Diffusion layers GRAIN BOUNDARIES GRAIN SIZE INTERMETALLIC COMPOUNDS IRON Iron compounds LAYERS Magnetic anisotropy PLATINUM Platinum compounds SPUTTERING THIN FILMS
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Beschreibung
Zusammenfassung:	B was co-sputtered with FePt films, leading to a granular structure; however, in addition to segregating at grain boundaries, local bonding of Fe-B was formed, which suppressed the ordering of FePt and thus degraded the perpendicular anisotropy. A boron capping layer was deposited on FePt:C (28 vol. %) films and B diffused into FePt:C grain boundaries during post-annealing. FePt:(B, C) films revealed a reduced grain size of 5.5 nm and perpendicular coercivity of 2T. Co-additions of B and C into FePt films may provide an alternative tuning knob to manipulate the microstructure and magnetic anisotropy of FePt films.
ISSN:	0021-8979 1089-7550
DOI:	10.1063/1.4862941