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Applied Physics Letters / Volume 88 / Issue 25 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 88, 252510 (2006); http://dx.doi.org/10.1063/1.2216031 (3 pages)

Low damping in epitaxial sputtered iron films

C. Scheck, L. Cheng, and W. E. Bailey

Materials Science and Engineering Program, Department of Applied Physics and Applied Mathematics, Columbia University, 500 W 120th Street, New York, New York 10027

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(Received 16 February 2006; accepted 22 May 2006; published online 22 June 2006)

We show that sputtered, pure epitaxial iron films can have high-frequency loss as low as, or lower than, any known metallic ferromagnetic heterostructure. Minimum 34 GHz ferromagnetic resonance linewidths of 41±2 Oe are demonstrated, some ∼ 5%–10% lower than the previous minimum reported for molecular beam epitaxially deposited Fe. Intrinsic and extrinsic damping have been separated over 0–40 GHz, giving a lower bound for intrinsic LL(G) relaxation rates of λ or G = 85±5 MHz (α = 0.0027±0.0001) and for extrinsic η ∼ 30–50 MHz. Swept-frequency measurements indicate the potential for integrated frequency domain devices with Q>100 at 30–40Ghz.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

iron, ferromagnetic materials, metallic epitaxial layers, magnetic epitaxial layers, ferromagnetic resonance, ferromagnetic relaxation, damping

PACS

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 76.50.+g

    Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance

  • 75.50.Bb

    Fe and its alloys

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2216031

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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