ANISOTROPIC MAGNET, ITS MANUFACTURING METHOD, AND MOTOR USING IT

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PROBLEM TO BE SOLVED : To provide an anisotropic switching spring magnet that has a large degree of anisotropy, a large squareness ratio, and a high maximum energy product. SOLUTION : The anisotropic switching spring magnet contains at least three phases of R2Fe14B phase, α-Fe phase, and R-Cu phase; and the composition formula of the magnet is expressed by RxFe100-x-y-zByCuz (wherein, R denotes one, two, or more kinds of rare-earth elements, and x, y, and z respectively denote numbers meeting 2≤x≤11, 1≤y≤10, and 0.5≤z≤5). When the cross section of the magnet is observed under a microscope, crystal grains 3 of the R-Cu phase intervene along the grain boundary surfaces 1a, 2a of crystal grains 1 of the R2Fe14B phase and crystal grains 2 of the α-Fe phase in the grain boundaries of the crystal grains 1 and 2. In addition, the largest observed grain diameters a and b of the crystal grains 1 and 2 are respectively ≤300 nm and 10-50 nm and the interval of at least one spot where the crystal grains 3 intervene is ≤37 nm.