The magnetic material and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a magnetic material capable of developing high coercive force even without using Dy, etc.SOLUTION : The magnetic material comprises a main phase including a RFeB crystal grain (R : rare earth elements), and a grain boundary phase formed between the crystal grains. The crystal grain has a shape with round corners, and a maximum width of 500 nm or less, and the grain boundary phase include a crystal aggregate with nano size of a minimum width of one nm or more. The magnetic material is obtained, for example, by heating an adhesion amorphous material with a diffusion material (for example, R-Cu) adhered to a R-Fe-B amorphous material to form in parallel the main phase including the RFeB crystal grain, and the grain boundary phase formed between the crystal grains. Thereby, the magnetic material with very high coercive force is obtained even without diffusing Dy, etc. being rare elements into the grain boundary.