Method for manufacturing Halbach magnet array and Halbach magnet array

A method for manufacturing a Halbach magnet array, the method comprising in this order:

• a) magnetizing at least one first magnetic material piece and at least one second magnetic material piece in a direction parallel to a first direction,
• wherein the at least one first magnetic material piece and the at least one second magnetic material piece are alternately arranged in a second direction perpendicular to the first direction with a third magnetic material piece interposed therebetween,
• wherein each of the at least one first magnetic material piece adheres to the adjacent third magnetic material piece via a non-magnetic layer with a thickness t1,
• wherein each of the at least one second magnetic material piece adheres to the adjacent third magnetic material piece via a non-magnetic layer with a thickness t2,
• wherein the thickness t1 and the thickness t2 satisfy a formula t1<t2,
• wherein the at least one first magnetic material piece and the at least one second magnetic material piece have easy axes of magnetization parallel to the first direction,
• wherein the third magnetic material piece has an easy axis of magnetization parallel to the second direction, and
• wherein the direction of magnetizing the at least one first magnetic material piece is different from the direction of magnetizing the at least one second magnetic material piece by 180°, and
• b) magnetizing the third magnetic material piece in a direction parallel to the second direction such that the third magnetic material piece has a south pole opposed to the adjacent first magnetic material piece and a north pole opposed to the adjacent second magnetic material piece.