Fe3O4 Epitaxial Thin Films and Heterostructures: Magnetotransport and Magnetic Properties

In this article, we review our recent research on Fe3O4 epitaxial thin films and Fe3O4/MgO/Fe epitaxial heterostructures. More specifically, we report on the magnetotransport properties of Fe3O4 epitaxial films in a wide range of film thicknesses and temperatures, focusing on the anomalous, planar and ordinary Hall effects. We also summarize our insight on the origin of the enhanced magnetic moment found in ultra-thin magnetite films (thickness t < 5 nm). Finally, our work on the growth, and structural and magnetic characterization of heteroepitaxial Fe3O4/MgO/Fe trilayers is presented.

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Structural and magnetic characterization of mixed valence Co(II, III)xZn1−xO epitaxial thin films

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2013.10.059 ◽

2014 ◽

Vol 354 ◽

pp. 39-43 ◽

Cited By ~ 3

Author(s):

D.S. Negi ◽

B. Loukya ◽

K. Dileep ◽

R. Sahu ◽

S. Shetty ◽

...

Keyword(s):

Thin Films ◽

Mixed Valence ◽

Epitaxial Thin Films ◽

Magnetic Characterization

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Microstructural Magnetic Characterization of Annealed Non-Oriented Electrical Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.915.190 ◽

2018 ◽

Vol 915 ◽

pp. 190-195

Author(s):

Evangelos Hristoforou ◽

Athanasios G. Mamalis

Keyword(s):

Magnetic Properties ◽

Magnetic Permeability ◽

Electrical Steel ◽

Barkhausen Noise ◽

Magnetic Barkhausen Noise ◽

Magnetic Characterization ◽

Microstructural Changes ◽

Wide Range ◽

Nondestructive Characterization

The present paper investigates the utilization of the magnetic Barkhausen noise and magnetic permeability methods for the nondestructive characterization of annealed non-oriented electrical steel samples which were isothermally annealed in a wide range of temperatures (400°C – 950°C) and subsequently cooled in air. The resulting magnetic properties were compared with the microstructural changes occurring during annealing.

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Magnetic Characterization of CoFe2O4 Nanoparticles

MRS Proceedings ◽

10.1557/proc-789-n9.8 ◽

2003 ◽

Vol 789 ◽

Author(s):

G. Lawes ◽

B. Naughton ◽

D. R. Clark ◽

A. P. Ramirez ◽

R. Seshadri

Keyword(s):

Magnetic Properties ◽

Magnetic Nanoparticles ◽

Ac Susceptibility ◽

Measurement Techniques ◽

Anomalous Behavior ◽

Magnetic Characteristics ◽

Magnetic Characterization ◽

Wide Range ◽

Co Precipitation

We have synthesized CoFe2O4 nanoparticles with length scales ranging from 3.5 nm to 14.2 nm. We have characterized the magnetic properties of these samples using both DC and AC magnetization, and find some slightly anomalous behavior in two of the samples. We tentatively attribute these features to interactions between the magnetic nanoparticles.There is a great deal of interest in understanding the physical basis for the magnetic properties of nanoparticles in order to facilitate their incorporation into a wide range of commercial applications. By studying the magnetic characteristics of CoFe2O4 nanoparticles using bulk measurement techniques, we are able to probe the properties of both the individual nanoparticles and interactions in these systems. In this report, we discuss our magnetic characterization of a series of CoFe2O4 nanoparticles grown using an aqueous co-precipitation technique. In addition to DC magnetization at fixed fields and temperatures, we also investigated the magnetic properties using AC susceptibility measurements. The long term goal of this research is to understand interparticle interactions in magnetic nanoparticles.

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