X-ray detected ferromagnetic resonance in thin films

Goulon, J.; Рогалев, А.; Wilhelm, F.; Jaouen, N.; Goulon-Gìnet, C.; Brouder, Christian

doi:10.1140/epjb/e2006-00367-6

Cited by 27 publications

(68 citation statements)

References 53 publications

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“…17, or by combining L 2 -and L 3 -edge fixed energy measurements, as argued in Ref. 19. Here, we report the compelling observation that ͑I ac + − I ac − ͒ ϰ −͑I dc + − I dc − ͒ independently on the absorption edge and material ͑Fig.…”

Section: Comparison Between Static-and Double-resonant Xmcdsupporting

confidence: 55%

“…Information about the electronic ground state, including the occupation and mixing of the valence electronic levels, crystal field, spin orbit, and exchange interactions is encoded in the energydependent spectral line shape as a function of photon energy, and can be extracted through multiplet calculations and sum rules. 10 Recently, several efforts have been made to combine the element sensitivity of x-ray absorption with magneticresonance measurements using either time-resolved [11][12][13][14][15] or time-invariant [16][17][18][19][20][21] schemes. Such experiments, carried out at fixed x-ray energy, enabled the measuring of elementresolved FMR spectra of pure and rare-earth-doped yttriumiron-garnet ͑YIG͒, [16][17][18][19][20][21] metal films, 17 as well as the relative phase and precession angle of the magnetization in coupled metal layers.…”

Section: Introductionmentioning

confidence: 99%

“…These findings demonstrate that MW absorption reflects in a nontrivial way on the Fe XAS and explain a previous controversy on the intensity of FMR peaks measured using x-ray detection at fixed photon energy. 16,20 Double-resonance XAS cannot simply be interpreted using a classical description of FMR in terms of a precessing magnetization vector with reduced projection onto the beam axis and related decrease in XMCD contrast, 16,17,19,20 in analogy with optical 8,9 and inductive FMR detection methods. 25 Rather, the simultaneous occurrence of angular momentum transfer induced by both MW and x-ray absorption must be taken into account into a local quantum-mechanical framework, as exemplified in Appendix for the case of a paramagnetic Fe 3+ ion.…”

Section: Introductionmentioning

confidence: 99%

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Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics

et al. 2009

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We show that double-resonance spectra recorded during the simultaneous absorption of x-ray and microwave ͑MW͒ photons are a fingerprint of the perturbed electronic configuration of atomic species driven to ferromagnetic resonance. X-ray absorption measurements performed as a function of x-ray energy and polarization over the Fe L 2,3 edges of single-crystal yttrium-iron garnet reveal MW-induced multiplet features related to angular momentum transfer from the MW field to localized Fe 3d magnetic sublevels. O K-edge absorption spectra demonstrate the formation of dynamic 2p-orbital magnetization components at O sites coupled to the Fe magnetic moments at tetrahedral and octahedral sites. These results are compared with double-resonance x-ray absorption spectra of Permalloy, showing that the MW transition probability is distributed according to the hybridization character of the 3d states and proportional to the unperturbed unoccupied magnetic density of states of metals and insulators.

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Section: Comparison Between Static-and Double-resonant Xmcdsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics

et al. 2009

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“…E ≥ 2 keV) since the beamline optics and instrumentation are fairly different for the two spectral ranges. Actually, XDMR experiments have been reported which used either hard-XMCD [1][2][3][4][5], or soft-XMCD [6][7][8][9][10][11][12][13][14][15]. In this paper, we shall concentrate on XDMR experiments to be performed at the X-ray absorption K-edges of magnetic 3d transition elements, i.e.…”

Section: Magnetic Resonance With Element and Edge Selectivitymentioning

confidence: 99%

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

Рогалев

Goulon

Goujon

et al. 2011

J Infrared Milli Terahz Waves

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X-ray Detected Magnetic Resonance (XDMR) is a novel spectroscopy which makes use of X-ray Magnetic Circular Dichroism (XMCD) to probe the resonant precession of local magnetization components in a strong microwave pump field. In Sections 1 and 2, we briefly review the conceptual bases of XDMR and the potential interest of increasing the pumping frequency up to the THz frequency range. In Sections 3-5, we discuss the feasibility of such challenging experiments. Starting from a comparison of experiments carried out either in the transverse (TRD) or longitudinal (LOD) detection geometries, we show that XDMR measurements at sub-THz frequencies require a substantial increase in pumping power: this is where a gyrotron source looks most appropriate. It is the aim of this paper to discuss how to conduct such experiments, emphasis being laid on feasibility tests recently carried out at the ESRF using a refurbished version of Gyrotron FU-II built at the FIR-FU. In this context, we propose a new detection scheme of sub-THz XDMR spectra based on the concept of frequency-mixing in LOD geometry.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Element sensitivity is obtained by choosing the x-ray photon energy corresponding to a core-to-valence band transition of the atom under investigation. The relatively large separation between the absorption lines of the different elements at the x-ray energies of interest as well as the x-ray absorption line shape dependence on the type and position of neighbor atoms allows one to study the magnetic properties of each element separately in well defined environments.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal detection of ferromagnetic resonance using x-ray transmission measurements

Boero

Rusponi

Kavich

et al. 2009

Review of Scientific Instruments

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We describe a setup for the x-ray detection of ferromagnetic resonance in the longitudinal geometry using element-specific transmission measurements. Thin magnetic film samples are placed in a static magnetic field collinear with the propagation direction of a polarized soft x-ray beam and driven to ferromagnetic resonance by a continuous wave microwave magnetic field perpendicular to it. The transmitted photon flux is measured both as a function of the x-ray photon energy and as a function of the applied static magnetic field. We report experiments performed on a 15 nm film of doped Permalloy ͑Ni 73 Fe 18 Gd 7 Co 2 ͒ at the L 3 / L 2 -edges of Fe, Co, and Ni. The achieved ferromagnetic resonance sensitivity is about 0.1 monolayers/ ͱ Hz. The obtained results are interpreted in the framework of a conductivity tensor based formalism. The factors limiting the sensitivity as well as different approaches for the x-ray detection of ferromagnetic resonance are discussed.

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X-ray detected ferromagnetic resonance in thin films

Cited by 27 publications

References 53 publications

Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics

Double-resonant x-ray and microwave absorption: Atomic spectroscopy of precessional orbital and spin dynamics

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

Longitudinal detection of ferromagnetic resonance using x-ray transmission measurements

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