Provided are a magnetic marker and a magnetic marker detection system with a reduced magnetic force. The magnetic marker detection system (1S) in which magnetism generated from the magnetic marker (1) laid on a road surface (53) is detected by a magnetic sensor (2) attached to a vehicle's body floor (50) of a vehicle (5) is a system with the magnetic marker (1) and the magnetic sensor (2) in combination, the magnetic marker having a surface with a magnetic flux density equal to or smaller than 40 mT and the magnetic sensor using a magneto-impedance element including an amorphous wire as a magneto-sensitive body with impedance in a high-frequency region changing in accordance with an external magnetic field.

The present invention provides a permanent magnet unit in which insulating layers are located at positions where an eddy current can be reduced most effectively.

The permanent magnet unit includes at least one insulating layer, and a plurality of permanent magnet pieces located adjacent to each other with the at least one insulating layer in between. The at least one insulating layer is located at positions defined based on a magnitude of an eddy current flowing inside a permanent magnet, corresponding to a change in a magnetic field of the permanent magnet into which a plurality of the permanent magnet pieces are integrally formed without the at least one insulating layer.

Provided is a heretofore non-existing, novel rare-earth sintered magnet having both of an extremely low carbon content and an extremely small average particle size of magnet material particles. The sintered body for forming a rare-earth magnet comprises a large number of magnet material particles sintered together, wherein each of the magnet material particles contains a rare-earth substance and has an easy magnetization axis. This sintered body for forming a rare-earth magnet has a carbon content of 500 ppm or less, and the magnet material particles have an average particle size of 2 µm or less.

Provided are: a sintered body that forms a rare-earth magnet and is configured in a manner such that the divergence between the orientation angles of the easy axes of magnetization of magnet material particles and the orientation axis angle of the magnet material particles is kept within a prescribed range in an arbitrary micro-section of a magnet cross-section; and a rare-earth sintered magnet. This sintered body for forming a rare-earth magnet has two or more different regions exhibiting an orientation axis angle of at least 20°, given that the orientation axis angle is defined as the highest-frequency orientation angle among the orientation angles of the easy magnetization axes, relative to a pre-set reference line, of a plurality of magnet material particles in a rectangular section at an arbitrary position in a plane including the thickness direction and the widthwise direction. The orientation-angle variance angle is 16.0° or less relative to said orientation axis angle, given that the orientation-angle variance angle is defined on the basis of the difference between the orientation angles of the easy magnetization axes of the magnet material particles. One embodiment defines said section as a rectangular section containing 30 or more magnet material particles, and for example, containing 200 or 300 magnet material particles. It is preferable for the rectangular section to be a square. Another embodiment defines said section as a square section having 35µm sides.

A package of the present invention includes: a cigarette box (1) which opens and closes and includes front walls (10, 20) of an outer case (2) and an inner case (3) that overlap with each other, the cigarette box (1) further including a removal opening (25) that is opened as a result of the inner case (3) sliding from a closed position to an open position with respect to the outer case (2) and thereby decreasing a degree of overlap between the respective front walls (10, 20); an outer-side magnetic pole group (19) provided on the front wall (10) of the outer case (2) and having an arrangement pattern including S poles (19a) and N poles (19b); and an inner-side magnetic pole group (26) provided on the front wall (20) of the inner case (3) and having an arrangement pattern in which, at the closed position, the positions of S poles (26a) and N poles (26b) are reversed relative to the arrangement pattern of the outer-side magnetic pole group (19).

There is provided a ferrite powder for bonded magnets having a high iHc value usable even in a low temperature environment, a method for producing the same, and a bonded magnet using the ferrite powder and having high iHc value which can be used even in a low temperature environment, wherein a specific surface area is 2.20 m²/g or more and less than 3.20 m²/g; a compression density is 3.30 g/cm³ or more and less than 3.60 g/cm³, and a compressed molding has a coercive force of 3250 Oe or more and less than 3800 Oe.