Tailoring of magnetic properties of ultrathin epitaxial Fe films by Dy doping

We report on the controlled modification of relaxation parameters and magnetic moments of epitaxial Fe thin films through Dy doping. Ferromagnetic resonance measurements show that an increase of Dy doping from 0.1% to 5% gives a tripling in Gilbert damping, and more importantly a strongly enhanced a...

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Bibliographic Details
Published inAIP advances Vol. 5; no. 7; pp. 077117 - 077117-7
Main Authors Baker, A. A., Figueroa, A. I., van der Laan, G., Hesjedal, T.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.07.2015
AIP Publishing LLC
Subjects
ANISOTROPY
ANTIFERROMAGNETISM
DAMPING
Dichroism
Doping
DYSPROSIUM ADDITIONS
EPITAXY
Ferromagnetic films
FERROMAGNETIC MATERIALS
FERROMAGNETIC RESONANCE
FERROMAGNETISM
MAGNETIC CIRCULAR DICHROISM
Magnetic induction
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
Magnetism
MATERIALS SCIENCE
Parameter modification
RELAXATION
SPIN
Spintronics
THIN FILMS
X RADIATION
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Summary:We report on the controlled modification of relaxation parameters and magnetic moments of epitaxial Fe thin films through Dy doping. Ferromagnetic resonance measurements show that an increase of Dy doping from 0.1% to 5% gives a tripling in Gilbert damping, and more importantly a strongly enhanced anisotropic damping that can be qualitatively understood through the slow-relaxing impurity model. X-ray magnetic circular dichroism measurements show a pronounced suppression of the orbital moment of the Fe with Dy doping, leading to an almost threefold drop in the orbital to spin moment ratio, ml/ms. Doping with Dy can therefore be used to control both dynamic and static properties of thin ferromagnetic films for improved performance in spintronics device applications, mediated through the antiferromagnetic interaction of the 4f and 3d states.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4926599