Magnetic Properties of (Fe,Co)2B Alloys With Easy-Axis Anisotropy

Intrinsic magnetic properties of (Fe 1-xCo x) 2B (x = 0.20, 0.25, 0.30, 0.35) alloys have been studied on single crystals. Temperature dependence of both magnetocrystalline anisotropy constant K 1 and spontaneous magnetization M s has been determined from magnetization isotherms measured between 10 and 1000 K. The highest anisotropy constant K 1 was obtained at x = 0.25, K 1 = 494 kJ/m 3 at T = 10 K. The Curie temperature decreased from 966 to 930 K as x increased from 0.2 to 0.35.