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Title: Controlling the magnetocrystalline anisotropy of ε-Fe2O3

Abstract

The magnetocrystalline anisotropy of pristine and Co-substituted ε-Fe2O3 is investigated by density functional calculations. The epsilon-iron oxide is the only polymorph of Fe2O3 magnetoelectric in its antiferromagnetic ground states other crystalline forms being α-Fe2O3 (hematite), β-Fe2O3, and γ-Fe2O3 (maghemite). The magnetizations of the four iron sublattices are antiferromagnetically aligned with slightly different magnetic moments resulting in a ferrimagnetic structure. Compared to the naturally occurring hematite and maghemite, bulk ε-Fe2O3 is difficult to prepare, but ε-Fe2O3 nanomaterials of different geometries and feature sizes have been fabricated. A coercivity of 20 kOe [2 T] was reported in nanocomposites of ε-Fe2O3, and an upper bound for the magnetic anisotropy constant K at a low temperature of ε-Fe2O3 is previously measured to be 0.1 MJ/m3. In the Co-substituted oxides, one octahedral or tetrahedral Fe atom per unit cell has been replaced by Co. The cobalt substitution substantially enhances magnetization and anisotropy.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Indian Inst. of Technology (IIT), Mandi (India)
  2. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1609555
Grant/Contract Number:  
FG02-04ER46152
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Conference: 14. Joint MMM-Intermag Conference, Washington, DC (United States), 14-18 Jan 2019; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Science & Technology - Other Topics; Materials Science; Physics

Citation Formats

Ahamed, Imran, Skomski, Ralph, and Kashyap, Arti. Controlling the magnetocrystalline anisotropy of ε-Fe2O3. United States: N. p., 2019. Web. doi:10.1063/1.5080144.
Ahamed, Imran, Skomski, Ralph, & Kashyap, Arti. Controlling the magnetocrystalline anisotropy of ε-Fe2O3. United States. doi:10.1063/1.5080144.
Ahamed, Imran, Skomski, Ralph, and Kashyap, Arti. Mon . "Controlling the magnetocrystalline anisotropy of ε-Fe2O3". United States. doi:10.1063/1.5080144. https://www.osti.gov/servlets/purl/1609555.
@article{osti_1609555,
title = {Controlling the magnetocrystalline anisotropy of ε-Fe2O3},
author = {Ahamed, Imran and Skomski, Ralph and Kashyap, Arti},
abstractNote = {The magnetocrystalline anisotropy of pristine and Co-substituted ε-Fe2O3 is investigated by density functional calculations. The epsilon-iron oxide is the only polymorph of Fe2O3 magnetoelectric in its antiferromagnetic ground states other crystalline forms being α-Fe2O3 (hematite), β-Fe2O3, and γ-Fe2O3 (maghemite). The magnetizations of the four iron sublattices are antiferromagnetically aligned with slightly different magnetic moments resulting in a ferrimagnetic structure. Compared to the naturally occurring hematite and maghemite, bulk ε-Fe2O3 is difficult to prepare, but ε-Fe2O3 nanomaterials of different geometries and feature sizes have been fabricated. A coercivity of 20 kOe [2 T] was reported in nanocomposites of ε-Fe2O3, and an upper bound for the magnetic anisotropy constant K at a low temperature of ε-Fe2O3 is previously measured to be 0.1 MJ/m3. In the Co-substituted oxides, one octahedral or tetrahedral Fe atom per unit cell has been replaced by Co. The cobalt substitution substantially enhances magnetization and anisotropy.},
doi = {10.1063/1.5080144},
journal = {AIP Advances},
number = 3,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

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