Exchange-coupled FePtB nano-composite hard magnets produced by pulsed laser deposition
2010 (English)In: Materials Science & Engineering: B. Solid-state Materials for Advanced Technology, ISSN 0921-5107, Vol. 171, no 1-3, 62-68 p.Article in journal (Refereed) Published
Nano-composite FePtB thin films were deposited on naturally oxidized (1 0 0) silicon (Si) and glass (SiO2) substrates by using a pulsed laser deposition (PLO) technique. Effects of processing conditions on structural, surface and magnetic properties of the films were examined. Growth temperature (T-s) and the type of substrate (Si or SiO2) are shown to affect crystal structure and magnetic properties of FePtB thin films significantly. Under optimized processing conditions, a similar to 1.7 mu m thick FePtB film deposited on a glass substrate exhibits high coercivity (similar to 7.7 kOe), high reduced remanence [(M-r/M-s) similar to 0.9] and high energy product (BH)(max) = 71 kJ/m(3). The films exhibiting good hard magnetic properties are mainly made-up of nano-sized hard (L1(0)-FePt) and soft (iron-boride) magnetic phases, which are shown to be exchange coupled. Fabrication of hard magnetic thin films by a simple and fast technique such as PLD is very promising for the production of micro magnets for MEMS applications.
Place, publisher, year, edition, pages
2010. Vol. 171, no 1-3, 62-68 p.
FePtB thin films, Hard magnetic material, Exchange-coupled magnets, Nano-composite magnet, Pulsed laser deposition, Thin films
Other Engineering and Technologies not elsewhere specified
IdentifiersURN: urn:nbn:se:kth:diva-29506DOI: 10.1016/j.mseb.2010.03.070ISI: 000279680600013ScopusID: 2-s2.0-77953158167OAI: oai:DiVA.org:kth-29506DiVA: diva2:394555
QC 201102032011-02-032011-02-022012-05-11Bibliographically approved