Interfacial tuning of perpendicular magnetic anisotropy and spin magnetic moment in CoFe/Pd multilayers

We report on a strong perpendicular magnetic anisotropy in [CoFe 0.4nm/Pd t]6 (t=1.0–2.0nm) multilayers fabricated by DC sputtering in an ultrahigh vacuum chamber. Saturation magnetization, Ms, and uniaxial anisotropy, Ku, of the multilayers decrease with increasing the spacing thickness; with a Ms...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2014-01, Vol.350, p.42-46
Main Authors: Ngo, D.-T., Meng, Z.L., Tahmasebi, T., Yu, X., Thoeng, E., Yeo, L.H., Rusydi, A., Han, G.C, Teo, K.-L.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures)
Interfacial magnetism
Magnetic anisotropy
Magnetic domains and domain walls
Magnetic moment
Magnetic multilayers
Magnetic properties and materials
Magnetic properties of surface, thin films and multilayers
Magnetism
Multilayers
Palladium
Perpendicular magnetic anisotropy
Physics
Tuning
Ultrahigh vacuum
X-ray magnetic circular dischroism
X-rays
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Summary:We report on a strong perpendicular magnetic anisotropy in [CoFe 0.4nm/Pd t]6 (t=1.0–2.0nm) multilayers fabricated by DC sputtering in an ultrahigh vacuum chamber. Saturation magnetization, Ms, and uniaxial anisotropy, Ku, of the multilayers decrease with increasing the spacing thickness; with a Ms of 155emu/cc and a Ku of 1.14×105J/m3 at a spacing thickness of t=2nm. X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements reveal that spin and orbital magnetic moments of Co and Fe in CoFe film decrease as a function of Pd thickness, indicating the major contribution of surface/interfacial magnetism to the magnetic properties of the film. •Strong perpendicular magnetic anisotropy essentially contributed by interfacial anisotropy.•Controllably magnetic properties with low Ms, high Ku, high P.•Interfacial magnetic moments modified by CoFe/Pd interfaces with strong spin–orbit coupling.•Narrow Bloch walls with Néel caps.•Superior magnetic characteristics for spin-torque applications.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2013.08.063