Thermal evolution of magnetic anisotropy of Fe nanoparticles

J. H. Lai, C. C. Kuo, Y. C. Liu, J. C.A. Huang

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Magnetic properties and the surface morphology of Fe deposited on Pt/Al2O3(1 1 2̄ 0) were in situ studied by magneto-optical Kerr effect (MOKE) and scanning tunneling microscopy (STM), respectively. The surface morphology exhibits that the as-deposited Fe nanoparticels have a narrow sized distribution of diameter around 4.2 nm, revealing the major out-of-plane magnetization. After annealing to 200 °C, this out-of-plane magnetization is strongly enhanced while the sized distribution of nanoparticles is almost unchanged. For the further annealing procedure to 400 °C, the nanoparticles begin to coalesce into larger ones. Meanwhile, the magnetization reorients from out-of-plane to in-plane direction. Therefore, clear evidence of concurrence for nanoparticles coalescence and magnetization reorientation show that the surface evolution plays an important role on the magnetic transition.

Original languageEnglish
Pages (from-to)e803-e805
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SUPPL. PART 3
Publication statusPublished - 2007 Mar 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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