Assembly and method for joining and different kind of permanent magnet

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PURPOSE : To increase the bonding strength between a permanent magnet and a member of a different kind of material by constituting the bonding layer of a bonded body having the bonding layer formed through a heating process for bonding the permanent magnet to the member of a rare-earth-based alloy which becomes a liquid during the heating process and controlling the average thickness of the bonding layer within a prescribed range. CONSTITUTION : A bonded body 1 has a bonding layer 4 formed through a heating process for a permanent magnet 2 to a member 3 of a different kind of material 3. The layer 4 is composed of a rare-earth-based alloy which becomes a liquid during the heating process and the average thickness t1 of the layer 4 is controlled to 1μm<=t1 2, 000μm. The liquid resulting from the rare- earth-based alloy constituting the layer 4 is highly active and exerts excellent wettability against the magnet 2 and member 3. Since the liquefying temperature of the alloy can be adjusted to a relatively low level, the changes of the characteristics of the magnet 2 and member 3 can be avoided at the time of bonding the magnet 2 to the member 3 by heating. Therefore, a high bonding strength can be obtained between the magnet 2 and member 3.