Fine-tuning of canted magnetization in stepped Fe films through thickness variation, Au capping, and quantum confinement

Dąbrowski, M.; Cinal, M.; Schmid, A. K.; Kirschner, J.; Przybylski, M.

doi:10.1103/PhysRevB.99.184420

Fine-tuning of canted magnetization in stepped Fe films through thickness variation, Au capping, and quantum confinement

Journal Article · Thu May 16 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.184420· OSTI ID:1605690

Dąbrowski, M. ^[1]; Cinal, M. ^[2]; Schmid, A. K. ^[3]; Kirschner, J. ^[4]; Przybylski, M. ^[5]

Max-Planck-Inst. für Mikrostrukturphysik, Halle (Germany); Univ. of Exeter (United Kingdom)
Polish Academy of Science, Warsaw (Poland)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Max-Planck-Inst. für Mikrostrukturphysik, Halle (Germany); Martin-Luther-Univ., Halle (Germany)
Max-Planck-Inst. für Mikrostrukturphysik, Halle (Germany); AGH - Univ. of Science and Technology, Krakow (Poland)

Here, we present a joint experimental and theoretical study that demonstrates how to efficiently control a canted state of magnetization in Fe films grown on Ag(001) vicinal surface and precisely characterize it with the magneto-optical Kerr effect. It is shown that by employing different mechanisms to tune the magnetization tilting angle, any magnetization orientation within the plane perpendicular to the step edges can be achieved. In particular, increasing the Fe film thickness leads to continuous rotation of the magnetization easy axis toward the film surface and the sense of this rotation in uncovered films is opposite to that in films covered with Au. Another tuning mechanism is provided by oscillatory changes of the tilting angle at low temperatures due to formation of quantum well states in Fe films. The observed canting of magnetization is explained within a phenomenological model by an interplay of the shape anisotropy and two magnetocrystalline anisotropy terms, perpendicular and step-induced anisotropies, which results in an effective uniaxial magnetic anisotropy. The fitted thickness dependencies of the anisotropy constants accurately reproduce experimental variations of the tilting angle with both Fe and Au thicknesses as well as transient changes of the magnetization orientation in ultrathin Fe films upon submonolayer Au coverage, observed with spin-polarized low-energy electron microscopy.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1605690

Alternate ID(s):: OSTI ID: 1513047

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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