High-energy-product MnBi films with controllable anisotropy

Wenyong Zhang, Parashu Kharel, Shah Valloppilly, Lanping Yue, David J Sellmyer

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

High-anisotropy NiAs-type MnBi films are produced by in situ annealing of Bi/Mn/Bi trilayers, [Bi/Mn/Bi]n multilayers, and subsequent magnetic field annealing. Phase components, crystallographic anisotropy, and magnetic properties of the MnxBi100-x thin films exhibits strong dependence on Mn concentration. High-purity MnBi thin films with perfect c-axis orientation are obtained by carefully controlling the Mn/Bi ratio. An energy product of 16.3MGOe, which is the highest value reported so far, is achieved for the x=50 film of thickness t=100nm. The MnBi thick film (t=2μm) changes from isotropic to anisotropic after magnetic field annealing. Depending on the direction of the applied field during magnetic field annealing, the MnBi thick film may have out-of-plane or in-plane anisotropy. This control of anisotropy direction enables applications of MnBi films in permanent-magnet, spintronic devices, or magnetic micro-electro-mechanical systems. In addition, the room-temperature magnetocrystalline anisotropy constant and saturation polarization of the hard magnetic MnBi phase are determined to be K=K1+K2=15.0Mergscm-3 and Js=8.2kG, respectively.

Original languageEnglish (US)
Pages (from-to)1934-1939
Number of pages6
JournalPhysica Status Solidi (B) Basic Research
Volume252
Issue number9
DOIs
StatePublished - Sep 1 2015

Fingerprint

Anisotropy
Annealing
anisotropy
products
Magnetic fields
Thick films
annealing
thick films
Magnetocrystalline anisotropy
Thin films
Magnetoelectronics
magnetic fields
energy
Permanent magnets
Magnetic properties
thin films
Multilayers
permanent magnets
Polarization
purity

Keywords

  • Anisotropy
  • High-energy-product
  • Magnetic films
  • Rare-earth-free

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

High-energy-product MnBi films with controllable anisotropy. / Zhang, Wenyong; Kharel, Parashu; Valloppilly, Shah; Yue, Lanping; Sellmyer, David J.

In: Physica Status Solidi (B) Basic Research, Vol. 252, No. 9, 01.09.2015, p. 1934-1939.

Research output: Contribution to journalArticle

Zhang, Wenyong ; Kharel, Parashu ; Valloppilly, Shah ; Yue, Lanping ; Sellmyer, David J. / High-energy-product MnBi films with controllable anisotropy. In: Physica Status Solidi (B) Basic Research. 2015 ; Vol. 252, No. 9. pp. 1934-1939.
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