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Evolution of anisotropy in bcc Fe distorted by interstitial boron

Gölden, Dominik ; Zhang, Hongbin ; Radulov, Iliya ; Dirba, Imants ; Komissinskiy, Philipp ; Hildebrandt, Erwin ; 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
[Artikel] , (2018)

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

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2018
Autor(en): Gölden, Dominik ; Zhang, Hongbin ; Radulov, Iliya ; Dirba, Imants ; Komissinskiy, Philipp ; Hildebrandt, Erwin ; Alff, Lambert
Titel: Evolution of anisotropy in bcc Fe distorted by interstitial boron
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Physical Review B
Band: 97
(Heft-)Nummer: 1
Verlag: APS Publishing
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Theorie magnetischer Materialien
Hinterlegungsdatum: 21 Mär 2018 10:03
DOI: 10.1103/PhysRevB.97.014411
Offizielle URL: https://doi.org/10.1103/PhysRevB.97.014411
Sponsoren: We thank the German federal state of Hessen through its excellence program LOEWE “RESPONSE” for financial support.
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