By E. Burzo (auth.), H.P.J. Wijn (eds.)
Volume III/27 covers the magnetic homes of inorganic compounds in keeping with transition components. it might probably as a result be regarded as a complement to volumes III/4 and III/12 Magnetic and different houses of magnetic oxides and relatedcompounds which seemed in 1970 and within the interval 1978 - 1982 respectively. In a manner this quantity additionally kinds a counterpart to quantity III/19, within which the magnetic houses of metals, alloys and steel compounds are compiled. the current subvolume III/27h on oxides covers these crystalline and vitreous oxidic boron compounds for which the magnetic homes basically depend upon the presence of 3d transition components within the constitution. a lot recognition is given to the relation among the optical and the magnetic homes of some of the substances.
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Extra info for Boron Containing Oxides
FeBO,. 21 kOe) (a) and field (T = 90 K) (b) dependencesof n, the phonon relaxation parameter [82K3]. At T = 18 K, the phonon relaxation exhibits a maximum that can be attributed to the presenceof Fe’’ impurity ions in crystals. It is a considerable growth of phonon damping with increasing magnetic field. The dependence of q on the magnetic field points to a substantial contribution of processesin which magnons participate at the phonon relaxation. Table 7. FeBO,. 7 ... 26 [76Jl] [78Jl] ‘) The parameters agree well among themselves except for Hi and Hi which vary from sample to sample.
FeBO,. The field dependenceof the frequency of the MSM spectrum at 77 K (o-uniform AFMR, Omagnetostatic modes; A-coupled oscillations). The appearanceof satellite peaks in addition to the main MSM spectrum in the frequency range 32 *.. 37 GHz is shown. Such a kind of field-frequency dependenceis characteristic for coupled oscillations. There are magnetic oscillations (MSM) in the sample. On the other hand this sample of length, L, is a dielectric resonator for electromagnetic oscillations with eigen-frequencyvg = c/2L&x 30 GHz.
A perpendicular magnetic anisotropy is necessary for the labyrinth domain structure to be present. Owing to the symmetry conditions there is no uniaxial anisotropy field in the basal plane of bulk crystal. This fact suggests that there is a surface magnetic anisotropy. The analysis of the-surface properties by Kerr effect (Fig. 70) shows that there really is a difference between the magnetism of the bulk material and of their surface (Fig. 71). The surface magnetization is represented by a macroscopical transition magnetic layer, the result of the presence of surface magnetic anisotropy.