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

Journal Article · Wed Jul 15 00:00:00 EDT 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4926599· OSTI ID:22493939

Baker, A. A. ^[1]; Figueroa, A. I.; Laan, G. van der ^[2]; Hesjedal, T. ^[1]

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1. Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU (United Kingdom)
2. Magnetic Spectroscopy Group, Diamond Light Source, Didcot, OX11 0DE (United Kingdom)

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, m{sub l}/m{sub s}. 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.

• OSTI ID: 22493939
• Journal Information: AIP Advances, Vol. 5, Issue 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ANTIFERROMAGNETISM
DAMPING
DYSPROSIUM ADDITIONS
EPITAXY
FERROMAGNETIC MATERIALS
FERROMAGNETIC RESONANCE
FERROMAGNETISM
MAGNETIC CIRCULAR DICHROISM
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
RELAXATION
SPIN
THIN FILMS
X RADIATION