Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.1: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster D

Twisted magnetocaloric effect by exchange bias in double perovskite SmCaCoMnO6 — •Manisha Bansal, Wasim Akram, and Tuhin Maity — School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India

Exchange bias (EB) is unarguably popular magnetic phenomenon due to its industry oriented applicability like memory devices and sensors. EB is widely reported in various types of materials such as core-shell nanoparticles, multiferroics, double-perovskites (DP), etc. Here, we report a twisted magneto caloric effect (MCE) from twisted crossover between isothermal magnetic hysteresis (MH) curves, due to a giant EB of ~8500 Oe in DP system of ferrimagnetic (FIM) SmCaCoMnO6- ferromagnetic (FM) Sm0.1Ca0.9MnO3 at T*10 K. The twisted MCE leads to an enhanced inverse MCE (entropy change ~ -3 J/Kg-K for the change of field ~70 kOe at 2 K); three times greater than the direct MCE observed. Both MCE and EB are found to be highly field dependent. Variation of EB with bias field emphasizes the importance of de-pinning threshold field which corroborates with the behavior of isothermal MH curves with respect to the field at low temperatures. The strong coupling between EB and MCE effects is due to the spin glass between the primary FIM SmCaCoMnO6 and secondary FM Sm0.1Ca0.9MnO3 phases, confirmed by magnetic remanence, ac susceptibility, and time dependent magnetic relaxation measurements. Thus, both EB and MCE have a common origin. The interesting results will lead to energy-efficient spintronic devices.

Keywords: Magnetism; Exchange bias; Magnetocaloric effect; Double perovskites; Spintronics