Magnetomechanical coupling, ΔE effect, and permeability in FeSiB and FeNiMoB alloys

Abstract

Measurements of magnetomechanical coupling, ΔE effect, and relative permeability have been made as a function of bias field and annealing temperature and time in transversely annealed samples of Metglas R a) alloy 2605S-2 (Fe78Si9B13), Metglas alloy 2605S-3 (Fe79Si5B16), and Metglas alloy 2826MB (Fe40Ni38Mo4B18). Annealing temperatures and times were varied from 300 to 450 °C and 15 to 60 min, respectively. The bias field which generates the largest coupling factor in these alloys is less than 1 Oe. From an application point of view, this low optimum field has a distinct advantage in power requirements over the 11 Oe field required for Metglas alloy 2605CO1 but the low field requirement is a marked disadvantage when considering bias field stability. That is, a 0.5 Oe change in field can result in greatly reduced coupling in the present alloys versus a very small change in 2605CO.

Wireless Magnetoelastic Resonance Sensors: A Critical Review

“…19. Another way to increase the sensor performance and the magnitude of the ∆E effect is by annealing the sensor while exposed to a transverse magnetic field [21,22,29,30]. Fig.…”

Theoretical investigation of magnetoelectric surface acoustic wave characteristics of ZnO/Metglas layered composite

“…The magnetomechanical coupling and ∆E effect of Metglas have been well studied in early 1980s. According to these work, 14,21,22 giant ∆E value of 150% can be obtained after transversely annealing Metglas under magnetic field. The ∆E effect is independent of the frequency of magnetic field as far as the frequency is lower than the bulk resonance frequency of Metglas ribbon.…”

“…Finally, please note that the d f /dH is not zero at H=0, about -154 MHz/Oe, indicating that the MESAW still has very high sensitivity without magnetic bias. In the case of geomagnetic magnetic field detection, selecting other Metglas ribbons, for example 2605S-3 (Fe 79 Si 5 B 16 ), may allow one to tune the optimal magnetic bias to 0.5-0.6 Oe, 14 which is exactly the geomagnetic field.…”

“…the phase velocity dispersion (dv/dE) and the ∆E effect (dE/dH). It is well known that Metglas ribbon is very soft and has giant ∆E effect up to 100-150%, 14 therefore, it is selected as substrate in current work. Our definition of d f /dH is analogue to the high frequency magnetoelectric coupling coefficient defined by Srinivasan and his coauthors, 4 except that f here means the center frequency of SAW instead of the ferromagnetic resonance frequency.…”

Magnetoelastic sensors in combination with nanometer-scale honeycombed thin film ceramic TiO2 for remote query measurement of humidity

“…A dc magnetic field, superimposed with the ac magnetic field, is used to effectively offset the magnetic anisotropy of the sensor material enhancing the magnetoelastic properties. 4,7 . This dc biasing field can be supplied either by a field coil, or by adjacent placement of a magnetically hard thick film.…”