Nonlinear geometric scaling of coercivity in a three-dimensional nanoscale analog of spin ice
| Autor: | N. A. Grigoryeva, A. A. Mistonov, Dirk Menzel, I. S. Shishkin, S. V. Grigoriev, I. S. Dubitskiy |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Magnetic moment Inverse 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology 01 natural sciences Spin ice Condensed Matter::Materials Science Magnetization 0103 physical sciences 0210 nano-technology Anisotropy Saturation (magnetic) Scaling |
| Zdroj: | Physical Review B. 94 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.94.064424 |
| Popis: | Magnetization hysteresis loops of a three-dimensional nanoscale analog of spin ice based on the nickel inverse opal-like structure (IOLS) have been studied at room temperature. The samples are produced by filling nickel into the voids of artificial opal-like films. The spin ice behavior is induced by tetrahedral elements within the IOLS, which have the same arrangement of magnetic moments as a spin ice. The thickness of the films vary from a two-dimensional, i.e., single-layered, antidot array to a three-dimensional, i.e., multilayered, structure. The coercive force, the saturation, and the irreversibility field have been measured in dependence of the thickness of the IOLS for in-plane and out-of-plane applied fields. The irreversibility and saturation fields change abruptly from the antidot array to the three-dimensional IOLS and remain constant upon further increase of the number of layers $n$. The coercive force ${H}_{c}$ seems to increase logarithmically with increasing $n$ as ${H}_{c}={H}_{c0}+\ensuremath{\alpha}ln(n+1)$. The logarithmic law implies the avalanchelike remagnetization of anisotropic structural elements connecting tetrahedral and cubic nodes in the IOLS. We conclude that the ``ice rule'' is the base of mechanism regulating this process. |
| Databáze: | OpenAIRE |
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