The effect of the substitution of Cu for Mn on magnetic and magnetocaloric properties of Ni50Mn34In16

• Published in: Journal of magnetism and magnetic materials Vol. 368; pp. 191 - 197
• Main Authors: Kaya, M., Yildirim, S., Yüzüak, E., Dincer, I., Ellialtioglu, R., Elerman, Y.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Magnetic measurement; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Magnetocaloric effect; Magnetocaloric effect, magnetic cooling; Martensitic transformations; Martensitic transition; Materials science; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Magnetocaloric effect; Martensitic transition; Magnetic measurement; Nickel alloys; Magnetization; Impurity density; Indium alloys; Martensitic transformations; Magnetic field effects; Magnetic hysteresis; Copper additions; Metamagnetism; Magnetocaloric effects; Temperature effects; Manganese alloys; Heusler alloys
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.05.021

The influence of Cu substitution for Mn on magnetic and magnetocaloric properties has been investigated in Ni50Mn34−xCuxIn16 (x=1.3 and 1.6) Heusler alloys by using calorimetric and magnetic measurements. The temperature dependent magnetization measurements and calorimetric studies indicate that martensitic transition temperatures shift to higher temperatures with increasing valence electron concentrations, e/a. The isothermal magnetization curves around the martensitic transition temperatures show a typical metamagnetic behavior. Associated with that, large positive values of magnetic entropy changes around structural transition region were determined by using the Maxwell and Clausius–Clapeyron relations. The maximum magnetic entropy change values were found to be 25.2 and 5.7Jkg−1K−1 for Ni50Mn34−xCuxIn16 (x=1.3 and 1.6) alloys by Maxwell relation in a magnetic field change of 2T. In order to understand the limit can be reached for, the magnetic entropy change values recalculated by Clausius–Clapeyron relation. Obtained maximum entropy change values are 22.8 and 16.3Jkg−1K−1 for Ni50Mn34−xCuxIn16 (x=1.3 and 1.6) alloys by Clausius–Clapeyron relation. •Ni50Mn34−xCuxIn16 alloys are prepared by an arc-melting method.•Structural properties are characterized by XRD, DSC and SEM.•Magnetic entropy change values are estimated by Maxwell and Clausius–Clapeyron equations.