Metamagnetism, Multiple Magnetic Transitions and Wide Temperature Range Magnetocaloric Effect in Dy{sub 6.5}Co{sub 2}Si{sub 2.5} Alloy

Journal Article · Wed May 15 04:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4849-7· OSTI ID:22921272

Arun, K.; Rashid, T. P. ^[1]; Curlik, Ivan; Ilkovic, Sergej; Reiffers, Marian ^[2]; Dzubinska, Andrea ^[3]

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1. National Institute of Technology, Intermetallics and Non-linear Optics Laboratory, Department of Physics (India)
2. Presov University, Faculty of Humanities and Natural Sciences (Slovakia)
3. P. J. Šafárik University, Faculty of Natural Sciences (Slovakia)

We report the structure, magnetic, thermodynamic, transport, and magnetocaloric properties of Dy{sub 6.5}Co{sub 2}Si{sub 2.5} alloy. It shows that this alloy has been formed in three phases viz., Dy{sub 5}Si{sub 3}, Dy{sub 3}Co{sub 2.2}Si{sub 1.8}, and Dy{sub 3}Co with four successive magnetic transitions named as T{sub 1}, T{sub 2}, T{sub 3},T{sub 4}, at 43, 74.7, 90.5, and 132.4 K, respectively. The magnetic measurements display competing ferromagnetic and antiferromagnetic interactions in the alloy. At 2.5 K, the alloy exhibits hard ferromagnetic properties with a coercive field of 0.8 T. Metamagnetism is also evidenced in the isothermal magnetization measurements. The Arrot plot shows that this material undergoes first-order magnetic transitions below 47 K, and above which, magnetic transitions are of second order. The four successive magnetic transitions together with competing magnetic interactions give rise to a broadened magnetocaloric effect (MCE) peak with temperature width of ΔT = 83.8 and 93.2 K and consequently a large RC value of 474 and 739 J/kg, for a magnetic field change of 0–5 and 0–7 T, respectively. Additionally, it is found that the alloy exhibits negative magnetoresistance and attains a value of − 11 and − 7% at 2.5 and 50 K, respectively, in applied magnetic field of 9 T. Thus, the peculiar magnetic and magnetocaloric properties make the Dy{sub 6.5}Co{sub 2}Si{sub 2.5} alloy promising not only for low-temperature magnetic refrigeration but also for fundamental study perspectives.

• OSTI ID: 22921272
• Journal Information: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 5 Vol. 32; ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
COBALT COMPOUNDS
DYSPROSIUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETORESISTANCE
SILICON COMPOUNDS
TERNARY ALLOY SYSTEMS
THERMODYNAMICS
TRANSITION TEMPERATURE