Abstract
The magnetic properties observed after various thermal-magnetic treatments for a (Co0.85Fe0.15)83.6Ni4.4Zr7B4Cu1 alloy are compared with those for a (Co0.88Fe0.12)79.4Nb2.6Si9B9 alloy of similar Co:Fe ratio which exhibited a large field induced anisotropy in previous work. The qualitative conclusions arrived at here also apply to the (Co0.85Fe0.15)88Zr7B4Cu1 alloy without Ni. For the transverse magnetic field annealed (Co0.85Fe0.15)83.6Ni4.4Zr7B4Cu1 alloy, the highest anisotropy fields HK (HK∼35–40Oe), field induced anisotropies KU (KU∼1700–2000J∕m3), and lowest coercivities HC (HC∼0.5–1.5Oe at f=3kHz) were observed for field annealed amorphous ribbons as compared to field crystallized ribbons. For the (Co0.88Fe0.12)79.4Nb2.6Si9B9 alloy, the field induced anisotropy is a maximum for field crystallized ribbons (HK∼28–45Oe, KU∼800–1800J∕m3) and the increase in dynamic coercivity (HC∼0.5–1Oe at f=3kHz) observed upon crystallization is much less dramatic. The field annealed amorphous alloy of composition (Co0.85Fe0.15)83.6Ni4.4Zr7B4Cu1 exhibited field induced anisotropies and dynamic coercivities that are competitive with the field crystallized alloys of composition (Co0.88Fe0.12)79.4Nb2.6Si9B9.
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