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The intergrain exchange coupling in Sm(Co,Fe,Cu,Zr)z magnets with z = 7.0 and 7.5

Ren-Jie Chen1, Jin-Zhi Wang2, Hong-Wei Zhang2, Bao-Gen Shen2 and Aru Yan1

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The magnetic behaviour of Sm(Co,Fe,Cu,Zr)z ribbons with z = 7.0 and 7.5 is investigated. The Henkel plots indicate that there is a strong intergrain exchange coupling (IGEC) effect in these ribbons. It is the IGEC that results in the phenomena of the interaction domains and remanence enhancement in the ribbons at room temperature. The contributions of IGEC and dipolar interaction to irreversible magnetization have been analysed to explain the phenomenon of open recoil loops. Due to the difference of the intensity of the IGEC, the magnetization changes with the component of the Sm(Co,Fe,Cu,Zr)z ribbons.


PACS

75.50.Cc Other ferromagnetic metals and alloys

75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

75.50.Ww Permanent magnets

75.60.Ch Domain walls and domain structure

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 15 (7 August 2007)

Received 11 April 2007, in final form 24 May 2007

Published 13 July 2007



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