Numéro |
J. Phys. IV France
Volume 08, Numéro PR2, June 1998
Soft Magnetic Materials 13
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Page(s) | Pr2-229 - Pr2-232 | |
DOI | https://doi.org/10.1051/jp4:1998254 |
J. Phys. IV France 08 (1998) Pr2-229-Pr2-232
DOI: 10.1051/jp4:1998254
Magnetic anisotropy and coercivity in MgO/Fe (tFe)/Ag films
T. Tolinski and J. BaszynskiInstitute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznan, Poland
Abstract
Magnetic systems with reduced dimensionality show critical features, such as perpendicular
surface anisotropy, enhanced magnetic moment. We have compared the magnetic properties of the iron thin films
deposited by electron beam evaporation onto MgO and glass/Ag(buffer) substrates. The steps on the MgO(001)
substrates of height =4.1 nm were imagined by AFM. FMR has been employed to study the magnetic anisotropy
HK, and coercivity HC was measured using VSM. In the iron films on MgO substrate the
strong in-plane fourfold anisotropy (K1=4.8x104 J/m3 for tFe=23nm)
was observed. The anisotropy field scales with the iron film thickness. HC appeared
to be significantly reduced in comparison with HK (HK=2K1/M=10xHC). This result was ascribed
to the pinning effects occurring at the steps on the substrate surface. The iron films on glass/Ag
were characterized by weak uniaxial anisotropy (Ku=0.28x104 J/m3) consistent with the coercivity.
© EDP Sciences 1998