Magnetostrictive element having optimized bias-field-dependent resonant frequency characteristic
US5949334A · kind A · utility
5Cited by
23References
35Claims
0Family size
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Key dates
| Filing date | Feb 14, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Feb 14, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S148/003
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A magnetostrictive element for use in a magnetomechanical marker has a resonant frequency characteristic that is at a minimum at a bias field level corresponding to the operating point of the magnetomechanical marker. The magnetostrictive element has a magnetomechanical coupling factor k in the range 0.28 to 0.4 at the operating point. The magnetostrictive element is formed by applying current-annealing to an iron-nickel-cobalt based amorphous metal ribbon, or by cross-field annealing an iron-nickel-cobalt alloy that includes a few percent chromium and/or niobium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.