Study of extrinsic magnetic properties of Mn-Mg-Zn ferrite nanoparticles at liquid nitrogen temperature

IF 1.8 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2025-03-05 DOI:10.1016/j.cryogenics.2025.104055

S.A.V. Prasad , Ch. Srinivas , R. Jeevan Kumar , E. Ranjith Kumar , Sher Singh Meena , Pramod Bhatt , Debashish Sarkar , D.L. Sastry

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引用次数: 0

Abstract

Magnetic behaviour of Mn_xMg_0.8–_xZn_0.2Fe₂O₄ (0 ≤ x ≤ 0.7 at a step of 0.1) nano ferrites has been explored. From the XRD patterns, the secondary phase of α-Fe₂O₃ is clearly evident in the ferrite compositions for x ≥ 0.4. The oxygen positional parameter (U) is in the range 0.387 – 0.389 and it is greater than the ideal value of 0.375. The bond angles provided an overview about the insight of magnetic behaviour of present series of ferrite samples. The M-H loops indicate the soft magnetic behaviour of present ferrite systems. For the ferrite composition x = 0.5, the highest value for saturation magnetization (M_s) of 35 and 42 emu/g has been reported at 300 and 80 K. The smaller values of remnant magnetization (M_r) and coercivity (H_c) indicate that the ferrite nanoparticles are single domain structure possessing core–shell morphology. For all values of M_s and M_r at 300 K and 80 K, the ratio of M_r/M_s is less than 0.5 indicating that the ferrite nanoparticles are under strong inter particle interactions. The magnetization-temperature (M-T) graphs revealed that blocking temperature (T_B) is above and nearer to 300 K. The magnetocrystalline anisotropy is a probable factor for the changes in the blocking temperature. The results are interpreted in terms of Y-K interactions, core–shell interactions, secondary phases and magnetocrystalline anisotropy.

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我们探索了 MnxMg0.8-xZn0.2Fe2O4 （0 ≤ x ≤ 0.7，步长为 0.1）纳米铁氧体的磁性。从 XRD 图谱来看，在 x ≥ 0.4 的铁氧体成分中，α-Fe2O3 的次生相非常明显。氧位置参数（U）在 0.387 - 0.389 之间，大于理想值 0.375。键角概述了本系列铁氧体样品的磁性特征。M-H 环表明了目前铁氧体系统的软磁行为。残余磁化（Mr）和矫顽力（Hc）值较小，表明铁氧体纳米粒子是具有核壳形态的单畴结构。在 300 K 和 80 K 时，对于所有的 Ms 和 Mr 值，Mr/Ms 的比值都小于 0.5，这表明铁氧体纳米粒子之间的相互作用很强。磁化-温度（M-T）图显示，阻挡温度（TB）高于并接近 300 K。研究结果从 Y-K 相互作用、核壳相互作用、次生相和磁晶各向异性等方面进行了解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryogenics 物理-热力学

CiteScore

3.80

自引率

9.50%

发文量

审稿时长

2.1 months

期刊介绍： Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics