Magnetic properties of nanocrystalline Fe–Co–Cu–M–Si–B alloys (M: Nb, Zr)

The magnetic properties of nanocrystalline Fe–Co–Cu–M–Si–B alloys (M: Nb, Zr) annealed without or under a magnetic field have been studied. The Nb-containing alloys and the Zr-containing alloys showed similar dependence of magnetic properties on Co content. The induced magnetic anisotropy constant Ku for nanocrystalline Fe78.8−xCoxCu0.6M2.6Si9B9 alloys (M: Nb, Zr) showed maximum values at the same Co content, x=70. However, Ku for the Nb-containing alloys at x=70 was larger than that for the Zr-containing alloy. The alloys containing 70 at.% Co, annealed under a transverse magnetic field, showed good properties at high frequencies.