Very low loss ultrathin Co-based amorphous ribbon cores
Ultrathin Co-based amorphous ribbons with a thickness of 6--10 ..mu..m were fabricated by a single roller quenching method in vacuum. The compositions of the alloys were zero magnetostrictive: Fe/sub 4.7/Co/sub 70.3/Si/sub 15/B/sub 10/ and (Fe/sub 0.05/Co/sub 0.95/)/sub 71/(Si/sub 0.5/B/sub 0.5/)/sub 29/. The ribbons obtained had good smoothness and dimensional uniformity. The core loss of toroidal samples 15 mm in diameter was measured after annealing. The loss decreased with decreasing ribbon thickness. In the case of 6.4-..mu..m-thick (Fe,Co)/sub 71/(Si,B)/sub 29/ amorphous ribbon, the values at 100 kHz and 1 MHz were 40 mW/cm/sup 3/ and 1.8 W/cm/sup 3/ for B/sub m/ = 0.1 T, respectively. The former was 1/4 that of Mn-Zn ferrites or 1/2 that of 5-..mu..m-thick Supermalloy tape wound core loss. The latter was (2)/(3) that of 5-..mu..m Supermalloy tape wound core loss. In addition, the initial permeability beyond 100 kHz was also markedly improved by thickness reduction. The values of 6.4-..mu..m-thick (Fe,Co)/sub 71/(Si,B)/sub 29/ ribbon measured at 1 and 10 MHz were about 7000 and 1000 for H/sub m/ = 2 mOe, respectively.
- Research Organization:
- Miyagi National College of Technology, Natori, Miyagi, Japan
- OSTI ID:
- 6743789
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 64:10
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
COBALT BASE ALLOYS
MAGNETIC PROPERTIES
IRON ALLOYS
MAGNETIC CORES
SILICON BORIDES
AMORPHOUS STATE
ENERGY LOSSES
THICKNESS
THIN FILMS
ALLOYS
BORIDES
BORON COMPOUNDS
COBALT ALLOYS
DIMENSIONS
FILMS
LOSSES
MAGNETIC STORAGE DEVICES
MEMORY DEVICES
PHYSICAL PROPERTIES
SILICON COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
420800 - Engineering- Electronic Circuits & Devices- (-1989)