Variation of magnetic ordering in ε-Fe3N nanoparticles

被引：24

作者：

Bhattacharyya, Sayan ^{[1
]}

Shivaprasad, S. M. ^{[2
]}

Gajbhiye, N. S. ^{[3
]}

机构：

[1] Indian Inst Sci Educ & Res, Dept Chem Sci, Nadia 741252, WB, India

[2] Jawaharlal Nehru Ctr Adv Sci Res, Bangalore 560064, Karnataka, India

[3] Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India

来源：

CHEMICAL PHYSICS LETTERS | 2010年 / 496卷 / 1-3期

关键词：

VAPOR CONDENSATION PROCESS; SPIN-GLASS; EXCHANGE BIAS; IRON-NITRIDE; ALPHA-FE; TEMPERATURE; PARTICLES; MOSSBAUER; NITROGEN; GROWTH;

D O I：

10.1016/j.cplett.2010.07.030

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The magnetic ordering in epsilon-Fe3N nanoparticles can be controlled by simultaneous variation of the particle size and nitrogen stoichiometry, which can lead to the ferromagnetism at room temperature. In this study, similar to 73 nm epsilon-Fe3-yN1+y (0.1 <= y <= 0.2) particles with saturation magnetization of 129.0 emu/g at 5 K (close to bulk 133.0 emu/g) are compared to similar to 20 nm epsilon-Fe2.999N1.001 particles. X-ray photoelectron spectroscopy (XPS) studies indicate the formation of nanometric surface oxide/oxynitride layer on the ferromagnetic/superparamagnetic nitride core. The nanoparticles are highly interacting with strong dipolar and exchange interactions. AC-susceptibility measurements confirm the spin-glass-like ordering at lower temperatures. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：122 / 127

页数：6

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