High coercivity in boron substituted Sm-Co melt-spun magnets (Journal article)

Makridis, S. S./ Litsardakis, G./ Panagiotopoulos, I./ Niarchos, D./ Zhang, Y./ Hadjipanayis, G. C.


The structural and magnetic properties of nanocomposite melt-spun Sm(Co0.74-x Fe0.1Cu0.12Zr0.04Bx)(7.5) magnets have been investigated as a function of boron content (x = 0.005 - 0.05), wheel speed and annealing conditions. The as-spun ribbons are nanocrystalline with fine microstructure and average grain size of 60-100 nm. X-ray diffraction indicates that the as-spun samples have the metastable hexagonal TbCu7-type structure phase and fcc-Co as a secondary soft phase. Magnetization at nonsaturating 5 T field is 45-72 emu/g and the reduced remanence (Mr/Ms) is above 0.8. The loop shape exhibits a characteristic step due to the soft magnetic phase. At room temperature, Hc values of 20-28 kOe are obtained for as spun samples, with a record value of 38.5 kOe for x = 0.04. At 380 degreesC Hc, values higher than 5 kOe are observed. Coercivity and loop shape are strongly dependent on annealing conditions.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών
Keywords: hard magnetic materials,permanent magnets,rare earth metals and compounds,temperature-dependence
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/14018
ISSN: 0018-9464
Link: <Go to ISI>://000178867200339
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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