Coverage dependence of magnetic domain structure and magnetic anisotropy in supported Fe nanoparticles on Al2O3/NiAl(100) | Zendy

WenChin Lin | Zendy; C. B. Wu | Zendy; Pin-Jui Hsu | Zendy; Hong-Yu Yen | Zendy; Zheng Gai | Zendy; Lan Gao | Zendy; Jian Shen | Zendy; MinnTsong Lin | Zendy

Open Access

Coverage dependence of magnetic domain structure and magnetic anisotropy in supported Fe nanoparticles on Al2O3/NiAl(100)

Author(s) -

WenChin Lin,

C. B. Wu,

Pin-Jui Hsu,

Hong-Yu Yen,

Zheng Gai,

Lan Gao,

Jian Shen,

MinnTsong Lin

Publication year - 2010

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.3457794

Subject(s) - materials science , magnetic force microscope , magnetic domain , nial , magnetic anisotropy , condensed matter physics , anisotropy , nanoparticle , magnetism , scanning tunneling microscope , magnetic nanoparticles , scanning electron microscope , hysteresis , single domain , magnetic hysteresis , magnetization , nanotechnology , intermetallic , optics , magnetic field , alloy , composite material , physics , quantum mechanics

Studies of magnetic domain and magnetic anisotropy in collected nanoparticles are crucial for both understanding interparticle interaction and engineering in applications. In order to characterize the microscopic surface morphology and the nanoscale magnetic domain structure of Fe nanoparticles, a scanning tunneling microscope and a scanning electron microscope with polarization analysis (SEMPA) were used in our experiment. For the coverage of 9–13 monolayers (MLs) Fe deposited on Al2O3/NiAl(100), circular and well-separated nanoparticles were grown. As the coverage increased up to 23–33 ML, these Fe nanoparticles started to coalesce and form elongated islands. Therefore a transition from isotropic to anisotropic in-plane magnetism was observed. Our proposed uniaxial magnetic anisotropy models effectively explain the azimuthal angle dependent two-step hysteresis loops. Moreover, the in situ measured SEMPA images clearly show the coverage dependent evolution of magnetic domain structure. Variations in inte...

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