Evaluation of phase transformation in ferromagnetic shape memory Fe-Pd alloy by magnetic Barkhausen noise

Yasubumi Furuya, Shizuka Tamoto, Takeshi Kubota, Teiko Okazaki, Nesbitt W. Hagood, Mark Spearing

研究成果: Article査読

4 被引用数 (Scopus)


The possibility to detect the phase transformation with martensites by heating or cooling as well as stress-loading in ferromagnetic shape memory Fe-30at%Pd alloy thin foil by using magnetic Barkhausen noise (MBHN) sensor was studied. MBHN is caused by the irregular interactions between magnetic domain and thermally activated martensite twins during magnetization. In general, the envelope of the BHN voltage vs time signals in Fe-29.6at%Pd ribbon showed two peaks during magnetization, where secondary peak at intermediate state of magnetization process decreased with increasing temperature, while the BHN envelopes in pure iron (αFe) and pure nickel (Ni) did not change with increasing temperature. The variety of BHN due to the phase transformation was apt to arise at higher frequency part of spectrum during intermediate state of magnetization process and it decreased with disappearance of martensite twins. Besides, BHN increased monotonically with increasing loading stress and then, it decreased with unloading, however BHN showed large hysteresis between loading and unloading passes. Based on the experimental results from BHN measurements for both thermoelastic and stress-induced martensite phase transformations in Fe-30at%Pd ribbon samples, MBHN method seems a useful technique to non-destructive evaluation of martensite phase transformation of ferromagnetic shape memory alloy.

ジャーナルProceedings of SPIE-The International Society for Optical Engineering
出版ステータスPublished - 2002

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


「Evaluation of phase transformation in ferromagnetic shape memory Fe-Pd alloy by magnetic Barkhausen noise」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。