Metallic ferromagnetic films with magnetic damping under 1.4 × 10-3.

Abstract:

:Low-damping magnetic materials have been widely used in microwave and spintronic applications because of their low energy loss and high sensitivity. While the Gilbert damping constant can reach 10-4 to 10-5 in some insulating ferromagnets, metallic ferromagnets generally have larger damping due to magnon scattering by conduction electrons. Meanwhile, low-damping metallic ferromagnets are desired for charge-based spintronic devices. Here, we report the growth of Co25Fe75 epitaxial films with excellent crystalline quality evident by the clear Laue oscillations and exceptionally narrow rocking curve in the X-ray diffraction scans as well as from scanning transmission electron microscopy. Remarkably, the Co25Fe75 epitaxial films exhibit a damping constant <1.4 × 10-3, which is comparable to the values for some high-quality Y3Fe5O12 films. This record low damping for metallic ferromagnets offers new opportunities for charge-based applications such as spin-transfer-torque-induced switching and magnetic oscillations.Owing to their conductivity, low-damping metallic ferromagnets are preferred to insulating ferromagnets in charge-based spintronic devices, but are not yet well developed. Here the authors achieve low magnetic damping in CoFe epitaxial films which is comparable to conventional insulating ferromagnetic YIG films.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lee AJ,Brangham JT,Cheng Y,White SP,Ruane WT,Esser BD,McComb DW,Hammel PC,Yang F

doi

10.1038/s41467-017-00332-x

subject

Has Abstract

pub_date

2017-08-10 00:00:00

pages

234

issue

1

issn

2041-1723

pii

10.1038/s41467-017-00332-x

journal_volume

8

pub_type

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