Study of the „ice-rule“ fulfilling in ferromagnetic inverse opals with enhanced anisotropy
The ferromagnetic inverse opal-like structure (IOLS) are interesting as a three-dimensional nanoscale analogue of highly frustrated systems called spin-ice. Magnetic moments in such systems obey so called “ice-rule”, standing, that two moments should go into tetrahedron and two – out. The local configuration of the magnetization coincide with the spatial network of IOLS following the directions determined by the symmetry of the structure. Since, in analogy to the “spin ice rule”, the magnetic flux conservation law for the elements of the structure must be fulfilled, ), we have developed a model for the distribution of the magnetic moments within the IOLS. In spin ice anisotropy is so strong, that makes magnetic moments there Ising-like. In attempt to closer the analogy we have performed acid etching of the samples to make the “bridges” thinner and, thus, enhance the anisotropy. The main aim of this work is to prove the applicability of the “ice-rule” to description of the magnetization distribution in ferromagnetic inverse opal-like structures.
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MENZEL Dirk; CHERNYSHOV Dmitry; DIADKIN Vadim; DUBITCKII Ilia; S.V. Grigoriev; Grigoryeva Natalia; HEINEMANN Andre; HONECKER Dirk; MISTONOV Alexander; SHISHKIN Ivan; SIEGFRIED Sven-Arne and VOROBIEV Alexei. (2015). Study of the „ice-rule“ fulfilling in ferromagnetic inverse opals with enhanced anisotropy. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-188