Enhanced spin - Reorientation temperature and origin of magnetocapacitance in HoFeO3

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:418

Article; Proceedings Paper

Kotnana, Ganesh¹  Jammalamadaka, S. Narayana¹ 

[1] Indian Inst Technol Hyderabad, Dept Phys, Magnet Mat & Device Phys Lab, Hyderabad 502285, Andhra Pradesh, India

关键词: Spin reorientation;    Orthoferrites;    Magnetocapacitance;    Magnetostriction;    Antiferromagnetism;   

DOI  :  10.1016/j.jmmm.2016.02.054

来源: Elsevier

【 摘 要 】

We report on the increase in the spin reorientation temperature in HoFe0.5Cr0.5O3 compound by isovalent substitution (Cr3+) at the Fe-site and the magnetocapacitance in the HoFeO3 compound. Spin reorientation transition is evident around 50 K and 150 K for the x=0 and x=0.5 compounds respectively. The increase in the spin reorientation transition temperature in case of x=0.5 compound can be attributed to the domination of the Ho3+-Fe3+ interaction over the F-e3+-Fe3+ interaction. Decrease in Neel temperature from 643 K (x=0) to 273 K (x=0.5) can be ascribed to the decrease in the interaction between antiferromagnetically aligned Fe3+ moments as a result of the dilution of the Fe3+ moments with the Cr3+ addition. From the magnetization M vs. magnetic field H variation it is evident that the coercivity, H-c decreases for x=0.5 compound, hinting the magnetic softening of the HoFeO3 compound. Observed magnetocapacitance could be due to lossy dielectric mechanism in the present compound. Indeed, present results would be helpful in understanding the physics behind rare-earth orthoferrites. (C) 2016 Elsevier B.V. All rights reserved.

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