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Evolution of anisotropy in bcc Fe distorted by interstitial boron

Gölden, Dominik and Zhang, Hongbin and Radulov, Iliya and Dirba, Imants and Komissinskiy, Philipp and Hildebrandt, Erwin and Alff, Lambert :
Evolution of anisotropy in bcc Fe distorted by interstitial boron.
[Online-Edition: https://doi.org/10.1103/PhysRevB.97.014411]
In: Physical Review B, 97 (1) ISSN 2469-9950
[Article] , (2018)

Official URL: https://doi.org/10.1103/PhysRevB.97.014411

Abstract

The evolution of magnetic anisotropy in bcc Fe as a function of interstitial boron atoms was investigated in thin films grown by molecular beam epitaxy. The thermodynamic nonequilibrium conditions during film growth allowed one to stabilize an interstitial boron content of about 14at.% accompanied by lattice tetragonalization. The c/a ratio scaled linearly with the boron content up to a maximum value of 1.05 at 300∘C substrate growth temperature, with a room-temperature magnetization of. In contrast to nitrogen interstitials, the magnetic easy axis remained in-plane with an anisotropy of approximately −5.1×106erg/cm3. Density functional theory calculations using the measured lattice parameters confirm this value and show that boron local ordering indeed favors in-plane magnetization. Given the increased temperature stability of boron interstitials as compared to nitrogen interstitials, this study will help to find possible ways to manipulate boron interstitials into a more favorable local order.

Item Type: Article
Erschienen: 2018
Creators: Gölden, Dominik and Zhang, Hongbin and Radulov, Iliya and Dirba, Imants and Komissinskiy, Philipp and Hildebrandt, Erwin and Alff, Lambert
Title: Evolution of anisotropy in bcc Fe distorted by interstitial boron
Language: English
Abstract:

The evolution of magnetic anisotropy in bcc Fe as a function of interstitial boron atoms was investigated in thin films grown by molecular beam epitaxy. The thermodynamic nonequilibrium conditions during film growth allowed one to stabilize an interstitial boron content of about 14at.% accompanied by lattice tetragonalization. The c/a ratio scaled linearly with the boron content up to a maximum value of 1.05 at 300∘C substrate growth temperature, with a room-temperature magnetization of. In contrast to nitrogen interstitials, the magnetic easy axis remained in-plane with an anisotropy of approximately −5.1×106erg/cm3. Density functional theory calculations using the measured lattice parameters confirm this value and show that boron local ordering indeed favors in-plane magnetization. Given the increased temperature stability of boron interstitials as compared to nitrogen interstitials, this study will help to find possible ways to manipulate boron interstitials into a more favorable local order.

Journal or Publication Title: Physical Review B
Volume: 97
Number: 1
Publisher: APS Publishing
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science > Theory of Magnetic Materials
Date Deposited: 21 Mar 2018 10:03
DOI: 10.1103/PhysRevB.97.014411
Official URL: https://doi.org/10.1103/PhysRevB.97.014411
Funders: We thank the German federal state of Hessen through its excellence program LOEWE “RESPONSE” for financial support.
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