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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Piezomagnetic Performance of Stress-Annealed FeAlB Alloys

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Bormio-Nunes, Cristina [1] ; de Souza Dias, Mateus Botani [1]
Total Authors: 2
[1] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena - Brazil
Total Affiliations: 1
Document type: Journal article
Source: IEEE Transactions on Magnetics; v. 53, n. 11 NOV 2017.
Web of Science Citations: 1

Two FeAlB polycrystalline alloys were stress annealed and had the piezomagnetic behavior determined before and after the stress annealing (SA). The concentration of boron is constant, 1.6% (at%). The alloys are basically formed by the phase Fe2B dispersed in a bcc matrix. The bcc matrix can be formed of a disordered and/or ordered structure, depending on ratio of Fe: Al, that was fixed as 86Fe: 14Al and 80Fe: 20Al. Magnetostriction and magnetic induction were measured as a function of magnetic field and compressive stresses. The piezomagnetic coefficient d lambda equivalent to d lambda/dH improvement due to SA was achieved, in which. is the magnetostriction and H the applied magnetic field. SA causes the reorientation of the magnetic moment of the material creating an artificial magnetic anisotropy. The behavior of the coefficient d(33) varies due to changes in Al content, since the magnetocrystalline anisotropy of the alloy depends on the ordering of the bcc matrix. Values of d(33) up to 4 nm/A were reached for the polycrystalline alloy with 14% Al (at%) in an interval of compressive stresses of 0 <= | sigma| <= 177 MPa. This large interval of compression stress is due to the presence of the Fe2B phase. (AU)

FAPESP's process: 14/16872-0 - Optimization of the piezomagnetic properties of Fe-Al-B alloys for use in the force sensors
Grantee:Mateus Botani de Souza Dias
Support type: Scholarships in Brazil - Doctorate