Uniform magnetic properties for an ultrahigh-density lattice of noninteracting co nanostructures |
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Authors: | Weiss N Cren T Epple M Rusponi S Baudot G Rohart S Tejeda A Repain V Rousset S Ohresser P Scheurer F Bencok P Brune H |
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Affiliation: | Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. |
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Abstract: | We report on the magnetic properties of two-dimensional Co nanoparticles arranged in macroscopically phase-coherent superlattices created by self-assembly on Au(788). Our particles have a density of 26 Tera/in2 (1 Tera=10(12)), are monodomain, and have uniaxial out-of-plane anisotropy. The distribution of the magnetic anisotropy energies has a half width at half maximum of 17%, a factor of 2 more narrow than the best results reported for superlattices of three-dimensional nanoparticles. Our data show the absence of magnetic interactions between the particles. Co/Au(788) thus constitutes an ideal model system to explore the ultimate density limit of magnetic recording. |
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