Magnetic field generating device

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PROBLEM TO BE SOLVED : To provide a magnetic field generator which generates a high-intensity magnetic field while suppressing non-invertible demagnetization caused by a demagnetized field and thermal demagnetization from an external magnetic field. SOLUTION : The magnetic field generator includes a magnetic circuit constitution in which a first R-Fe-B system sintered magnet having a magnetization direction in a direction orthogonal to a main surface opposing an air gap, and a second R-Fe-B system sintered magnet having a magnetization direction in a direction parallel with a main surface opposing the air gap are alternately arranged at the opposing face of a pair of yokes which oppose each other via the prescribed air gap so that the main surfaces become the same planes. The magnetic field generator is manufactured by comprising a rare-earth element concentration layer containing at least either of Dy or Tb which is a heavy rare-earth element at a main phase outer shell in the vicinity of the main surface of at least the second R-Fe-B system sintered magnet. COPYRIGHT : (C)2010, JPO&INPIT