Advances in ferromagnetic metallic glasses
Recent developments in transition metal glasses have resulted in the synthesis of an iron-rich glass (nominal composition, Fe/sub 80/B/sub 20/) in continuous ribbon form. The as-quenched glass shows a saturation moment of 1.99 ..mu../sub B//Fe atom at 4.2/sup 0/K, an induction of 16 kG at 300/sup 0/K, a ferromagnetic Curie temperature of 650/sup 0/K, a saturation magnetostriction of 30 x 10/sup -6/, and a coercivity H/sub c/ of about 100 MOe. Large domains, elongated parallel to the ribbon axis, are observed. Both Moessbauer and FMR data indicate that the magnetic anisotropy (K = 3 x 10/sup 4/ erg/cm/sup 3/) is in the ribbon plane. Evidence is presented that boron donates less electrons to the d-band of transition metal atoms compared with other glass-forming metalloids such as phosphorus. Some of the low-field properties include: the permeability at 20 G, ..mu..(20) = 1,700, ..mu../sub max/ = 102,000 and core-loss, W approximately equals 0.3 to 0.4 watts/kg at f = 1 kHz and B/sub max/ = 1 kG. Field annealing results in improvements in these properties: A typical field-annealed toroid shows H/sub c/ approximately 40 mOe, ..mu..(20) = 4,000, ..mu../sub max/ = 320,000 and W = 0.1 watts/kg at f = 1 kHz and B/sub max/ = 1 kG. These properties represent significant improvements over existing iron-base metallic glasses and their commercial crystalline alloy counterparts.
- Research Organization:
- Allied Chemical Corp., Morristown, NJ
- OSTI ID:
- 7330753
- Journal Information:
- AIP (Am. Inst. Phys.) Conf. Proc.; (United States), Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Vol. 34; ISSN APCPC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BORIDES
BORON COMPOUNDS
CURIE POINT
DOMAIN STRUCTURE
FERROMAGNETIC MATERIALS
GLASS
HEAT TREATMENTS
IRON BORIDES
IRON COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETOSTRICTION
MATERIALS
PHYSICAL PROPERTIES
QUENCHING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE