title: Multi-frequency force-detected electron spin resonance in the millimeter-wave region up to 150 GHz.
abstract: In this article, a novel technique is developed for multi-frequency force-detected electron spin resonance (ESR) in the millimeter-wave region. We constructed a compact ESR probehead, in which the cantilever bending is sensitively detected by a fiber-optic Fabry-Perot interferometer. With this setup, ESR absorption of diphenyl-picrylhydrazyl radical (<1 μg) was clearly observed at multiple frequencies of up to 150 GHz. We also observed the hyperfine splitting of low-concentration Mn(2+) impurities(∼0.2%) in MgO.
authors.affiliation: Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Ohmichi
authors.affiliation: Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tokuda
authors.affiliation: Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Tabuse
authors.affiliation: Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Tsubokura
authors.affiliation: Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Okamoto
authors.affiliation: Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ohta