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Title: Spin Reorientation Transition in Fe-Rich Alloy Films on W(110): The Role of Magnetoelastic Anisotropy and Structural Transition

Abstract

Epitaxial Fe-rich alloy films of formulas Fe{sub 1-x}Ni{sub x}, Fe{sub 1-x}Co{sub x}, and Fe{sub 1-x}V{sub x} were grown on a W(110) substrate with a bcc structure without any structural transition at x<0.3. Using chemical pressure (inserting small amounts of Ni, Co, or V into Fe), the authors controlled the lattice constant of these alloy films and then measured the variation of spin reorientation thickness (t{sub r}) according to the alloy composition. The authors focused on the roles of the lattice constant of the film and the spin reorientation thickness that is closely related to the strain associated with the lattice mismatch between the thin film and the substrate.

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930620
Report Number(s):
BNL-80944-2008-JA
Journal ID: ISSN 0003-6951; APPLAB; TRN: US200904%%618
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 89
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; BCC LATTICES; COBALT ALLOYS; NICKEL ALLOYS; SPIN ORIENTATION; THIN FILMS; VANADIUM ALLOYS; SUBSTRATES; TUNGSTEN; PHASE TRANSFORMATIONS; national synchrotron light source

Citation Formats

Lee,H., Baek, I., and Vescovo, E.. Spin Reorientation Transition in Fe-Rich Alloy Films on W(110): The Role of Magnetoelastic Anisotropy and Structural Transition. United States: N. p., 2006. Web. doi:10.1063/1.2354488.
Lee,H., Baek, I., & Vescovo, E.. Spin Reorientation Transition in Fe-Rich Alloy Films on W(110): The Role of Magnetoelastic Anisotropy and Structural Transition. United States. doi:10.1063/1.2354488.
Lee,H., Baek, I., and Vescovo, E.. Sun . "Spin Reorientation Transition in Fe-Rich Alloy Films on W(110): The Role of Magnetoelastic Anisotropy and Structural Transition". United States. doi:10.1063/1.2354488.
@article{osti_930620,
title = {Spin Reorientation Transition in Fe-Rich Alloy Films on W(110): The Role of Magnetoelastic Anisotropy and Structural Transition},
author = {Lee,H. and Baek, I. and Vescovo, E.},
abstractNote = {Epitaxial Fe-rich alloy films of formulas Fe{sub 1-x}Ni{sub x}, Fe{sub 1-x}Co{sub x}, and Fe{sub 1-x}V{sub x} were grown on a W(110) substrate with a bcc structure without any structural transition at x<0.3. Using chemical pressure (inserting small amounts of Ni, Co, or V into Fe), the authors controlled the lattice constant of these alloy films and then measured the variation of spin reorientation thickness (t{sub r}) according to the alloy composition. The authors focused on the roles of the lattice constant of the film and the spin reorientation thickness that is closely related to the strain associated with the lattice mismatch between the thin film and the substrate.},
doi = {10.1063/1.2354488},
journal = {Applied Physics Letters},
number = ,
volume = 89,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • No abstract prepared.
  • We investigated the mechanism of the spin-reorientation transition (SRT) in the Ni/Fe/Ni/W(110) system using in situ low-energy electron microscopy, x-ray magnetic circular dichroism measurements, and first principles electronic structure calculations. We discovered that the growth of Fe on a flat Ni film on a W (110) crystal resulted in the formation of nanosized particles, instead of a uniform monolayer of Fe as commonly assumed. This interfacial nanostructure leads to a change of the system's dimensionality from two-dimensional- to three-dimensional-like, which simultaneously weakens the dipolar interaction and enhances the spin-orbit coupling in the system and drives the observed SRT.
  • Cited by 3
  • The magnetic properties of Fe films grown on GaAs(113)A substrates by molecular-beam epitaxy are studied using superconducting quantum interference device magnetometry for a wide range of thickness varying from 3.5 monolayers (MLs) to 100 nm (714 MLs). The first signature of ferromagnetism is found at a nominal coverage of about 4 MLs, attributed to a percolation phenomenon, similar to Fe on GaAs(001). The magnetic anisotropy of all samples is found to be a combination of varying strengths of an in-plane uniaxial magnetic anisotropy (UMA) and a four-fold magnetic anisotropy. Samples of thickness d{sub Fe}{<=}50 MLs exhibit a dominating UMA withmore » the easy and hard axes along [332] and [110], respectively, whereas samples of thickness d{sub Fe}{>=}70 MLs exhibit a dominating four-fold magnetic anisotropy with the easy axes along the in-plane <031> directions. The reorientation of the easy axis from [332] to the in-plane <031> axes is found to take place between 50 and 70 MLs, the same thickness range where the relaxation of the layer starts. The effective uniaxial magnetic anisotropy constant K{sub u}{sup eff} first increases with monolayer coverage up to about 10 MLs and then decreases with the increase in thickness. On the other hand, the effective four-fold anisotropy constant K{sub 1}{sup eff} first increases with monolayer coverage and then saturates close to the bulk value after about 20 MLs. From a comparison of our results with literature a common origin of UMA in Fe films on GaAs(001) and (113)A, i.e., the anisotropy of the bonding of Fe with As and Ga at the interface is anticipated.« less