R-T-B-BASED PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To provide an R-T-B-based permanent magnet suitable as a variable magnetic force magnet for variable magnetic flux motor, having a high residual magnetic flux density and a lower coersive force, and capable of changing the magnetic force reversibly by a small external magnetic field.SOLUTION : An R-T-B-based permanent magnet has a residual magnetic flux density Br2 satisfying a relation Br2/Br≥0.90, when applying 0.95 HcJ after applying an external magnetic field Hex, required for bringing a residual magnetic flux density Br to 0, and preferably contains main phase particles having a composition (R11-xR2x)2T14B(R1 is rare earth elements consisting of one kind or more of Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, R2 is an element containing at least one kind of Y, La, Ce, and T is Fe or one kind or more of transition metal element where Fe and Co are essential, 0.2≤x≤0.7).COPYRIGHT : (C)2016, JPO&INPIT