The pressure dependence of the saturation magnetization and Curie temperature was studied in melt-spun Fe 60 Mn 20 B 20 , Fe 56 Mn 24 B 20 and Fe 75 B 25 amorphous alloys up to 0.9 GPa corresponding to volume changes up to 0.45%. In addition, in-situ high-pressure (up to 40 GPa) X-ray diffraction was performed to determine the compressibility of the latter two alloys. Both the Curie temperature T C (at atmospheric pressure T C = 201 ± 3 and 159 ± 3 K) and the low-temperature saturation

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... tion M 5K, 5T decrease remarkably with increasing pressure: dT C /dp = -31 ± 0.5 and -32 ± 5 K/GPa and dlnM 5K, 5T /dp = -0.15 ± 0.02 and -0.13 ± 0.03 GPa -1 for x Mn = 20 and 24 at%, respectively. Compared to dlnM 5K, 5T /dp = -0.016 ± 0.003 2 GPa -1 measured for Fe 75 B 25 , the pressure dependence of M 5K, 5T is one order of magnitude larger in the ternary alloys. The bulk moduli for the Fe 56 Mn 24 B 20 and Fe 75 B 25 glasses were measured to be 152 GPa and 173 GPa, respectively. These data are also compared with the pressure dependence of the hyperfine-field and theoretical calculations of the saturation moment for Fe-B alloys reported in the literature. The results were interpreted within an inhomogeneous itinerant-electron model of ferromagnetism.