Values are representative nominal/reference values, not certified specifications. Grade designations and tolerances vary by manufacturer; verify against the linked datasheet before design or procurement. Blank cells mean a reliable grade-specific value has not been established.
Grade comparison
αBr: reversible temperature coefficient of remanence (Bᵣ). βHcJ: reversible temperature coefficient of intrinsic coercivity (HcJ). Values are indicative family-level ranges in %/°C near room temperature, repeated for each grade for convenience; they are not grade-specific certifications. The coefficient of normal coercivity (HcB) is not interchangeable with βHcJ. Alnico βHcJ is left unassigned pending a defensible source. Confirm test temperature interval and manufacturer values before applying.
Demagnetization curves and manufacturer references
Arnold Magnetic Technologies — product data and demagnetization curves · Arnold NdFeB · Arnold SmCo
Manufacturer links are reference starting points, not verified grade-specific curve URLs. Compare curves at the intended operating temperature and load line. In particular, do not infer elevated-temperature coercivity from room-temperature grade labels.