Low temperature magnetic force microscope study of magnetization reversal in patterned nanoislands of SrRuO 3

Livnat Landau, James W. Reiner, Lior Klein

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Abstract

SrRuO 3 is an itinerant ferromagnet (T c ∼ 150 K) characterized by large uniaxial magnetocrystalline anisotropy (K 1 ∼ 7.7 × 10 6 erg/cm 3) and relatively low saturation magnetization (M s = 213 emu/cm 3) - properties which make SrRuO 3 an extremely hard magnetic material. We have patterned arrays of rectangular nanoislands of a high quality epitaxial film of SrRuO 3 with sides ranging between 50 and 500 nm, and studied their magnetization reversal at 4 K using a low temperature magnetic force microscope. We find that the nucleation field for many of the nanoislands is very close to that expected by the Stoner-Wohlfarth model (∼ 3. 8 T) and from nanoislands which exhibit partial reversals we can determine an upper bound for the nucleation volume on the order of 100 × 100 × 10 nm 3. We also find that domain wall pinning in the nanoislands is extremely high and in some cases the depinning field exceeds ∼ 3 T.

Original languageEnglish
Article number07B901
JournalJournal of Applied Physics
Volume111
Issue number7
DOIs
StatePublished - 1 Apr 2012

Bibliographical note

Funding Information:
L. K. acknowledges support by the Israel Science Foundation founded by the Israel Academy of Sciences and Humanities. J. W. R. grew the samples at Stanford University in the laboratory of M. R. Beasley.

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