DOI: 10.1063/1.370319. Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe

Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe–P alloys

10.1063/1.370319

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

We have investigated the magnetic properties of bulk amorphous Pd40Ni40−xFexP20 (x=0–17.5) alloys. For Pd40Ni40P20 (x=0), the magnetic susceptibility consists of temperature-independent and Curie–Weiss-type terms. Alloys with x⩾5 are paramagnetic at high temperatures. With decreasing temperature, the amorphous alloys become superparamagnetic. At even lower temperatures, and under a weak applied magnetic field, these alloys are spin glasses, as evidenced by static and dynamic magnetic measurements. The spin-freezing temperature increases with increasing iron content and this is attributed to the role of the Ruderman–Kittel–Kasuya–Yosida interaction in creating the spin-glass state. The occurrence of a reentrant spin-glass behavior on cooling (superparamagnetism-to-ferromagnetism-to-spin-glass transition) is also observed for x=17.5 at a field ⩾50 Oe. An unexpected result is that the ferromagnetic state in the present bulk metallic glasses is field induced. Evidence for the field-induced ferromagnetic-like order is obtained from (a) straight regions in the susceptibility versus temperature curves measured at various fields, (b) an Arrott plot, and (c) time-independent magnetization. With increasing applied field, the spin-freezing temperature decreases and the Curie temperature increases, broadening the temperature range of the field-induced ferromagnetic-like state. The temporal decay of the thermoremanent magnetization in the amorphous alloy with x=17.5 is slower than that in typical crystalline spin glasses. The spin-freezing temperature of the amorphous alloy with x=17.5 decreases approximately logarithmically with applied field, which differs from the prediction of Néel’s model for spin glasses.

Bibliography

Shen, T. D., Schwarz, R. B., & Thompson, J. D. (1999). Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous PdâNiâFeâP alloys. Journal of Applied Physics, 85(8), 4110â4119.

Authors 3

T. D. Shen (first)
R. B. Schwarz (additional)
J. D. Thompson (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:59 a.m.)
Deposited	1 year, 6 months ago (Feb. 7, 2024, 3:21 a.m.)
Indexed	1 month, 1 week ago (July 28, 2025, 5:27 p.m.)
Issued	26 years, 4 months ago (April 15, 1999)
Published	26 years, 4 months ago (April 15, 1999)
Published Print	26 years, 4 months ago (April 15, 1999)

Funders 0

None

BibTeX

@article{Shen_1999, title={Paramagnetism, superparamagnetism, and spin-glass behavior in bulk amorphous Pd–Ni–Fe–P alloys}, volume={85}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.370319}, DOI={10.1063/1.370319}, number={8}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Shen, T. D. and Schwarz, R. B. and Thompson, J. D.}, year={1999}, month=apr, pages={4110–4119} }

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  "abstract": "<jats:p>We have investigated the magnetic properties of bulk amorphous Pd40Ni40\u2212xFexP20\u2008(x=0\u201317.5) alloys. For Pd40Ni40P20\u2008(x=0), the magnetic susceptibility consists of temperature-independent and Curie\u2013Weiss-type terms. Alloys with x\u2a7e5 are paramagnetic at high temperatures. With decreasing temperature, the amorphous alloys become superparamagnetic. At even lower temperatures, and under a weak applied magnetic field, these alloys are spin glasses, as evidenced by static and dynamic magnetic measurements. The spin-freezing temperature increases with increasing iron content and this is attributed to the role of the Ruderman\u2013Kittel\u2013Kasuya\u2013Yosida interaction in creating the spin-glass state. The occurrence of a reentrant spin-glass behavior on cooling (superparamagnetism-to-ferromagnetism-to-spin-glass transition) is also observed for x=17.5 at a field \u2a7e50 Oe. An unexpected result is that the ferromagnetic state in the present bulk metallic glasses is field induced. Evidence for the field-induced ferromagnetic-like order is obtained from (a) straight regions in the susceptibility versus temperature curves measured at various fields, (b) an Arrott plot, and (c) time-independent magnetization. With increasing applied field, the spin-freezing temperature decreases and the Curie temperature increases, broadening the temperature range of the field-induced ferromagnetic-like state. The temporal decay of the thermoremanent magnetization in the amorphous alloy with x=17.5 is slower than that in typical crystalline spin glasses. The spin-freezing temperature of the amorphous alloy with x=17.5 decreases approximately logarithmically with applied field, which differs from the prediction of N\u00e9el\u2019s model for spin glasses.</jats:p>",
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