Magnetization method and magnetization apparatus

A method for magnetizing a plurality of magnetic material pieces arranged in a first direction in order to form a Halbach array magnet, comprising

• a step of arranging the plurality of magnetic material pieces so that the plurality of magnetic material pieces includes at least one magnetic material piece that can produce a magnetic orientation in a direction inclined from a second direction perpendicular to the first direction;
• a first magnetization step of arranging, in one of areas sandwiching the plurality of magnetic material pieces in the second direction, a first magnetization part and a second magnetization part with a space therebetween in the first direction, and forming a magnetic path between the first and second magnetization parts through the magnetic material piece that can produce the magnetic orientation in the direction inclined from the second direction and thereby magnetizing the magnetic material piece disposed between the first and second magnetization parts;
• and
• a second magnetization step of disposing a third magnetization part in one of areas sandwiching the plurality of magnetic material pieces, and forming a magnetic path through, among the plurality of magnetic material pieces, a magnetic material piece that can produce a magnetic orientation in the second direction and thereby magnetizing the magnetic material piece that can produce the magnetic orientation in the second direction;
• wherein
• a magnetic material piece is disposed in one of the areas sandwiching the plurality of magnetic material pieces different from the one where the first and second magnetization parts are arranged in such a manner that this magnetic material piece is, in the second direction, opposed to the magnetic material piece that can produce the magnetic orientation in the direction inclined from the second direction,
• a fourth magnetization part is disposed in one of the areas sandwiching the plurality of magnetic material pieces different from the one where the third magnetization part is disposed in such a manner that the fourth magnetization part is opposed to the third magnetization part in the second direction, and
• a space between the third magnetization part and the fourth magnetization part disposed in one of the areas sandwiching the plurality of magnetic material pieces in the first direction is wider than a space between the first magnetization part and the second magnetization part disposed in the same area as the third and fourth magnetization parts.