We have formulated the requirements for ferrites that must be met to obtain rectangular and square hysteresis loops. We have studied the effect of micro-inhomogeneities on the rectangularity and squareness of the hysteresis loop. We have established a negative effect from α-Fe 2 O 3 inclusions, local tetragonal distortions of the cubic lattice, and linear micro-inhomogeneities. We have shown that the general reason for the high degree of squareness of the hysteresis loop for ferrites of all compositions having a rectangular hysteresis loop is granulated micro-inhomogeneities with an elevated concentration of cationic vacancies relative to the matrix. We have studied the conditions for the formation of such inhomogeneities.The shape of the magnetic hysteresis loop determines the area of application of ferrites and is characterized in particular by the rectangularity ratio B r /B m and the squareness ratio H st /H c (Fig. 1), and also the squareness of the pulse, expressed as the ratio of the useful signal uV 1 to the noise dV z (Fig. 2). The nature of spontaneous rectangularity and squareness of the hysteresis loop (RHL and SHL, respectively) is of theoretical and applied importance, and so it has
We have studied the magnetic and structural properties of the solid solutions 4 3 2 2 х -1 2 х O Fe Cu M + + + , where M = Mg, Ni, Co, Zn, Mn, 4 3 0.5х 2 2 х -1 0.5х O Fe Cu Me + + + + , were Me = Li, Cu, and (Mn 3 O 4 ) x (CuFe 2 O 4 ) 1−x . We have developed a new method for detecting a tetragonal phase and have used this method to determine the range of existence for solutions with a tetragonal structure. We explain the dependence of these ranges on the nature of M and Me.
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