Anisotropy fields and FMR linewidth in single-crystal Al, Ga and Sc substituted hexagonal ferrites with M structure

Modifications in magnetic anisotropy of M—type strontium hexaferrite crystals by swift heavy ion irradiation.

“…Mossbauer spectroscopic investigations of complex magnetic structures in Ga and In substituted M-type hexagonal ferrites suggest that the substitution pattern of Ga and In for iron in the sublattices of Sr-hexaferrites display commonalties [59]. On Gallium and Indium substitutions in SrFe 12 O 19 , the magnetic properties do get modified [60][61][62]. The mechanisms by which these substitutions bring about these modifications have been considered as minor perturbations on the fundamental magnetoplumbite (M-type) hexagonal ferrite structure and the related magnetic interactions are based on single-ion properties.…”

State of the art millimeter and sub-millimeter wave ferrite components and devices

“…Another solution is to use high anisotropy ferrite matenrals to avoid using "huge" external magnets, and in some cases it is possible to develop devices completely without biasing magnets. But, application of strongly anisotropic ferrite materials provides possibility to decrease substantially the necessary external working fields and, therefore to decrease, and in some cases to give up application of magnets at all [9,13,16].…”

“…Resonance isolator based on low-anisotropic ferrites requires large external magnetic fields. That is why highlyanisotropic ferrite materials -hexaferrites were used [9,13].…”

“…Further increasing of HR resonance frequencies, according to (3), is possible only through application of non-conducting magnetics monocrystals with large fields of anisotropy HA. The most perspective materials are highly-anisotropic ferrite of hexagonal structure (hexaferrites) as well as several types of antiferromagnetics [6,9].…”

Growth and defect structure of seeded solution grown Sc-substituted barium hexaferrite crystals using different seed orientation

“…Bulk hexaferrite crystals can also be obtained by the top-seeded solution growth (TSSG) technique in open crucibles using flux compositions without volatile components. Röschmann et al [3] have been reported about TSSG growth of barium hexaferrite (BaFe 12 O 19 ) on [0 0 0 1] orientated strontium hexagallate seeds in BaO-B 2 O 3 flux melts. The crystal quality reported was rather imperfect [4].…”