Magnetic Critical Behavior, Hall and Magneto-Impedance Effects in Fe-Co-Based Metallic Glasses

• Published in: IEEE transactions on magnetics Vol. 57; no. 2; pp. 1 - 6
• Main Authors: Rosales-Rivera, Andres, Gonzalez-Sanchez, Rafael F., Velasquez-Salazar, Abilo A., Lopez-Tabares, Jessica, Salazar-Henao, Nicolas A., Gomez-Montoya, Diego F., Saccone, Fabio D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-02-2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amorphous magnetic materials; Amorphous materials; Comparative studies; Critical temperature; Electromagnetism; Exchanging; Hall and magneto-impedance effects; Hall effect; Heisenberg theory; Impedance; Iron; Magnetic anisotropy; magnetic critical behavior; Magnetic field measurement; Magnetism; Magnetization; Magnetoimpedance; Magnetostriction; Metallic glasses; Perpendicular magnetic anisotropy; Soft magnetic materials; Statistical models; Three dimensional models
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2020.3013294

A comparative study of the magnetic critical behavior, magnetic anisotropy, Hall and magneto-impedance effects, and magnetic interactions is presented for Fe 70 Nb 10 B 20 and Co 70 Nb 10 B 20 metallic glasses. The critical behavior is studied by determining the critical exponents for zero-field magnetization (<inline-formula> <tex-math notation="LaTeX">\beta </tex-math></inline-formula>), critical isotherm (<inline-formula> <tex-math notation="LaTeX">\delta </tex-math></inline-formula>), and critical temperature <inline-formula> <tex-math notation="LaTeX">T_{\mathrm {C}} </tex-math></inline-formula>, from magnetization measurements using the method by Berger-Campillo et al. The corresponding (<inline-formula> <tex-math notation="LaTeX">\beta </tex-math></inline-formula>, <inline-formula> <tex-math notation="LaTeX">\delta </tex-math></inline-formula>, and <inline-formula> <tex-math notation="LaTeX">T_{\mathrm {C}} </tex-math></inline-formula>) values for Fe 70 Nb 10 B 20 and Co 70 Nb 10 B 20 are (0.341 ± 0.008, 4.00 ± 0.27, and 644.5 ± 25.5 K) and (0.399 ± 0.014, 4.25 ± 0.44, and 460 ± 32 K), respectively. These <inline-formula> <tex-math notation="LaTeX">\beta </tex-math></inline-formula> values indicate that the universality class of Fe 70 Nb 10 B 20 is consistent with the 3-D XY model, whereas Co 70 Nb 10 B 20 seems to be more close to the 3-D Heisenberg model. These <inline-formula> <tex-math notation="LaTeX">T_{\mathrm {C}} </tex-math></inline-formula> values indicate that the exchange interaction is weaker in Co 70 Nb 10 B 20 than in Fe 70 Nb 10 B 20 . The Hall effect experiments reveal an ordinary and extraordinary contribution to the Hall effect and a positive Hall constant. Furthermore, the extraordinary Hall contribution and magnetic anisotropy decrease more rapidly in Co 70 Nb 10 B 20 than in Fe 70 Nb 10 B 20 . The magneto-impedance curves exhibit the single-peak (SP) and two-peak (TP) behaviors. The possible magnetic interactions, including the spin-orbit interaction, the exchange interaction, and the magnetic dipolar interaction, might be active in these materials, and their possible effects on the <inline-formula> <tex-math notation="LaTeX">\beta </tex-math></inline-formula> value are analyzed.