Rare-earth cobalt permanent magnet, method of manufacturing the same, and device

A rare-earth cobalt permanent magnet comprising:

• 24 to 26 mass % of a rare-earth element R including Sm;
• 26 to 27 mass % of Fe;
• 4.2 to 4.6 mass % of Cu;
• 2.0 to 3.5 mass % of Zr;
• and
• Co and an unavoidable impurity as a remainder, wherein
• the R is a combination of Sm, Nd, and Pr where 6.0<Nd+Pr≤25 mass %, and a remainder is Sm,
• the rare-earth cobalt permanent magnet includes a cell phase including a crystalline phase of a Th2Zn17 structure, and a cell wall including a crystalline phase of an RCO5 structure enclosing the cell phase,
• a concentration of the R in the cell wall is higher than a concentration of the R in the cell phase by no less than 25 atomic %, and
• the rare-earth cobalt permanent magnet has a squareness ratio of no less than 67%, the squareness ratio being expressed by a ratio (Hk/Hcj) of a magnetic field (Hk) to a magnetic coercive force (Hcj), wherein the magnetic field (Hk) is a reverse magnetic field in which a magnetic flux density is at 90% of a residual magnetic flux density.