Ultra-soft magnetic properties and correlated phase analysis by {sup 57}Fe Mössbauer spectroscopy of Fe{sub 74}Cu{sub 0.8}Nb{sub 2.7}Si{sub 15.5}B{sub 7} alloy

Journal Article · Mon Feb 15 00:00:00 EST 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4941838· OSTI ID:22492439

Manjura Hoque, S.; Liba, S. I.; Akhter, Shireen ^[1]; Anirban, A. ^[2]; Choudhury, Shamima ^[3]

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1. Materials Science Division, Atomic Energy Centre, Dhaka 1217 (Bangladesh)
2. Semiconductor Physics Group, University of Cambridge (United Kingdom)
3. Department of Physics, University of Dhaka, Dhaka 1217 (Bangladesh)

A detailed study of magnetic softness has been performed on FINEMENT type of ribbons by investigating the BH loop with maximum applied field of 960 A/m. The ribbon with the composition of Fe{sub 74}Cu{sub 0.8}Nb{sub 2.7}Si{sub 15.5}B{sub 7} was synthesized by rapid solidification technique and the compositions volume fraction was controlled by changing the annealing condition. Detail phase analysis was performed through X-ray diffraction (XRD), Differential scanning calorimetry (DSC), Vibrating sample magnetometer (VSM) and Mössbauer spectroscopy in order to correlate the ultrasoft magnetic properties with the volume fraction of amorphous and α-Fe(Si) soft nano composites. Bright (BF) and dark field (DF) image with selective area diffraction (SAD) patterns by the transmission electron microscopy (TEM) of the sample annealed for the optimized annealed condition at 853 K for 3 min reveals nanocrystals with an average size between 10-15 nm possessing the bcc structure which matches with the grain size revealed by the X-ray diffraction. Kinetics of crystallization of α-Fe(Si) phases has been determined by DSC curves. Extremely small coercivity of 30.9 A/m and core loss of 2.5 W/Kg for the sample annealed at 853 K for 3 min was found. Similar values for other crystalline conditions were determined by using BH loop tracer with a maximum applied field of around 960 A/m. Mössbauer spectroscopy was used to determine chemical shift, hyperfine field distribution (HFD), and peak width of different phases. The volume fractions of the relative amount of amorphous and crystalline phases are also determined by Mössbauer spectroscopy. High saturation magnetization along with ultrasoft magnetic properties exhibits very high potentials technological applications.

• OSTI ID: 22492439
• Journal Information: AIP Advances, Vol. 6, Issue 2; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ANNEALING
BCC LATTICES
CALORIMETRY
CHEMICAL SHIFT
COERCIVE FORCE
CRYSTALLIZATION
GRAIN SIZE
IRON 57
IRON BASE ALLOYS
MAGNETIC PROPERTIES
MAGNETIZATION
MOESSBAUER EFFECT
NANOSTRUCTURES
PHASE STUDIES
SILICON ALLOYS
SOLIDIFICATION
TRANSMISSION ELECTRON MICROSCOPY
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION