Abstract
Impact of co-doping (Gd and Mn) on the magnetic properties has been systematically investigated in SmCrO3 compound. For the synthesized compound Sm0.9Gd0.1Cr0.85Mn0.15O3 (SGCMO), below the Neel transition temperature and under low applied magnetic field, temperature induced magnetization reversal at 105 K (crossover temperature) was noticed in the field cooled magnetization curve. Magnetization reversal attained maximum value of -1.03 emu/g at 17 K where spin reorientation occurred. The magnetization reversal disappeared under higher applied field. From the M-H plots an enhancement in the magnetization was observed due to Gd doping. Magnetocaloric effect at low temperatures measured through the magnetic entropy change was found sixteen times higher for this compound as compared to pristine SmCrO3 and twice to that of SmCr0.85Mn0.15O3 compound. The study reveals the importance of co-doping in tailoring the magnetic properties of rare-earth chromites.
Highlights
INTRODUCTIONWhich was associated to the grain boundary effects.[24] It exhibited ferroelectric nature; confirmed through Raman and dielectric spectroscopic techniques.[24,25] These properties make SCO a multiferroic material
In recent years, rare-earth orthochromites (RCrO3) have been extensively explored because they exhibit temperature induced magnetization reversal (TIMR) phenomenon.[1,2,3,4,5] This is useful in thermomagnetic switches and thermally assisted random access memories.[6,7] TIMR is defined as a temperature induced crossover of magnetization from a positive to negative value
Regardless of the magnetic nature of pristine SCO, manganese (Mn) doping in SCO induces magnetization reversal[5,28] and enhances the magnetocaloric effect (MCE) at low temperatures,[28] which is responsible for magnetic refrigeration
Summary
Which was associated to the grain boundary effects.[24] It exhibited ferroelectric nature; confirmed through Raman and dielectric spectroscopic techniques.[24,25] These properties make SCO a multiferroic material. Observation of TIMR in SCO is still controversial. Wu et al.[26] and Dash et al.[5] have not observe any sign of MR in this compound whereas Gupta et al.[27] reported giant temperature dependent magnetization reversal in SCO compound along with a large exchangebias and coercivity.[27] Regardless of the magnetic nature of pristine SCO, manganese (Mn) doping in SCO induces magnetization reversal[5,28] and enhances the magnetocaloric effect (MCE) at low temperatures,[28] which is responsible for magnetic refrigeration. We report the co-doping effect in SCO compound
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