The effect of cooling rate on magnetothermal properties of Fe₄₉Rh₅₁

Journal Article · 09 November 2019 · Journal of Magnetism and Magnetic Materials

DOI: https://doi.org/10.1016/j.jmmm.2019.166130 · OSTI ID:1577343

Sánchez-Valdés, C. F. ^[1]; Gimaev, R. R. ^[2]; López-Cruz, M. ^[3]; Sánchez Llamazares, J. L. ^[3]; Zverev, V. I. ^[4]; Tishin, A. M. ^[5]; Carvalho, A. M. G. ^[6]; Aguiar, D. J. M. ^[7]; Mudryk, Y. ^[8]; Pecharsky, V. K. ^[8]

---

1. Universidad Autónoma de Ciudad Juárez (UACJ), Chihuahua (Mexico)
2. National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI); Advanced Magnetic Technologies and Consulting LLC, Troitsk (Russia)
3. San Luis Potosí Inst. of Scientific Research and Technology (Mexico)
4. Lomonosov Moscow State Univ., Moscow (Russian Federation)
5. Advanced Magnetic Technologies and Consulting LLC, Troitsk (Russia); Lomonosov Moscow State Univ., Moscow (Russian Federation)
6. Universidade Estadual de Maringá (Brazil)
7. Universidade Tecnológica Federal do Paraná (UTFPR) (Brazil)
8. Ames Lab., and Iowa State Univ., Ames, IA (United States)

In this report, we have explored the effects of quenching rate on the thermal dependence of the magnetic entropy change ΔS_M(T) and the magnetic field induced hysteresis loss through the antiferromagnetic (AFM)↔ferromagnetic (FM) transformation in bulk Fe₄₉Rh₅₁. Two nearly identical square-prism-shaped samples were subjected to two different temperature cooling regimes; one was rapidly quenched (FQ) in iced-water and another slow cooled (SC) to room temperature at a cooling rate of 2 K/min. The temperature of the AFM↔FM transition is similar for both samples, but the FQ sample shows much sharper temperature- and magnetic field-induced magnetization change; in addition, the total magnetization change is 14% larger. In FQ material, the magnetocaloric effect, i.e., ΔS_M(T) quickly approaches saturation above 1 T and shows a large peak value at 2 T (13.9 versus 8.9 Jkg^–1 K^–1 in SC material), yet a larger average hysteresis loss FWHM in the temperature range coinciding with of the full-width at half-maximum of the ΔS_M(T) curve.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1577343
• Report Number(s): IS-J-10096
• Journal Information: Journal of Magnetism and Magnetic Materials, Vol. 498; ISSN 0304-8853
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English