Resonant magnetic reflection coefficients at the Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>p</mml:mi></mml:math>edge obtained with linearly and circularly polarized soft x rays

Mertins, H.-Ch.; Abramsohn, D.; Gaupp, A.; Schäfers, F.; Gudat, W.; Zaharko, O.; Grimmer, H.; Oppeneer, Peter M.

doi:10.1103/physrevb.66.184404

Cited by 54 publications

(48 citation statements)

References 44 publications

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“…5.1. In the polar (P-MOKE) geometry, the the magnetization is oriented perpendicular to the scattering plane and parallel to the surface, the change of the amplitude of the reflected light is measured [160,161].…”

Section: X-ray Resonant Magnetic Scatteringmentioning

confidence: 99%

Antiferromagnetic dipolar ordering in[Co2MnGe∕V]Nmultilayers

et al. 2005

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Section: X-ray Resonant Magnetic Scatteringmentioning

confidence: 99%

Antiferromagnetic dipolar ordering in[Co2MnGe∕V]Nmultilayers

et al. 2005

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“…Figure 1 (c) shows the photon-energy dependence of reflectivity and MCDR. Although the photon-energy dependence of MCDR is different from the circular dichroism obtained from x-ray absorption spectra [17], it is a suited measure of the sample magnetization [19]. We fixed the photon energy to be hν = 714 eV, and the time evolution of the intensities of reflectivity as well as XMCD at this photon energy are traced in order to investigate the electronic and magnetic dynamics of BaFeO 3 thin films.…”

mentioning

confidence: 99%

“…We recorded specular reflectivity data for two magnetization directions, R + and R − . The average reflectivity R = (R + + R − )/2 is a measure of the electronic and structural properties, while the magnetic circular dichroism in reflectivity (MCDR) sig-nal DR = (R + − R − )/2 is a measure of the sample magnetization [19]. A Ti-Sapphire laser (λ = 800 nm, hν = 1.55 eV) with the pulse width of ∼ 50 fs was employed as a pump laser with π polarization.…”

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confidence: 99%

Photoinduced Demagnetization and Insulator-to-Metal Transition in Ferromagnetic InsulatingBaFeO3Thin Films

et al. 2016

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We studied the electronic and magnetic dynamics of ferromagnetic insulating BaFeO3 thin films by using pump-probe time-resolved resonant x-ray reflectivity at the Fe 2p edge. By changing the excitation density, we found two distinctly different types of demagnetization with a clear threshold behavior. We assigned the demagnetization change from slow (∼ 150 ps) to fast (< 70 ps) to a transition into a metallic state induced by laser excitation. These results provide a novel approach for locally tuning magnetic dynamics. In analogy to heat assisted magnetic recording, metallization can locally tune the susceptibility for magnetic manipulation, allowing to spatially encode magnetic information.PACS numbers: 71.30.+h, 73.61.-r, 75.70.-i, 78.66.-w Control of magnetic states by optical excitations in magnetically ordered materials has attracted considerable attention since the demonstration of ultrafast demagnetization in Ni within 1 ps, explored by timeresolved magneto-optical Kerr effect studies [1]. Ultrafast demagnetization was also observed for other elementary ferromagnetic transition metals such as Co and Fe, and intermetallic alloys [2,3].Several mechanisms have been proposed to understand the ultrafast demagnetization. Beaurepaire et al. proposed a phenomenological "three-temperature model" in order to understand the ultrafast demagnetization of Ni, which considers three interacting reservoirs of electrons, spins, and lattice, and suggested the importance of direct electron-spin interactions. Since the electron, spin, and lattice systems are quite tightly coupled to each other in strongly correlated 3d transition metal oxides, it is interesting to investigate the photoinduced dynamics with respect to the electronic states and magnetism [4][5][6][7][8][9][10][11][12][13][14][15].For this study, we chose fully oxidized single crystalline BaFeO 3 thin films, which show unusual behaviors of ferromagnetic and insulating properties with saturation magnetization and Curie temperature of 3.2 µ B /formula unit and 115 K, respectively [16]. The large magnetic moment of BaFeO 3 thin films results in quite large peak intensity of Fe 2p x-ray magnetic circular dichroism (XMCD), ∼ 18 % of the x-ray absorption peak * Electronic address: wadati@issp.u-tokyo.ac.jp; URL: http://www.geocities.jp/qxbqd097/index2.htm intensity [17]. Thus, BaFeO 3 thin films are appropriate samples to carry out time-resolved magnetic circular dichroism experiments. Furthermore, the investigation of the demagnetization dynamics of insulators allows one to relate electronic structure to magnetic dynamics.In order to investigate the magnetic dynamics of ferromagnetic insulating BaFeO 3 thin films, we performed time-resolved reflectivity studies at the Femtospex slicing facility at the synchrotron radiation source BESSY II [18], using circularly polarized x-ray pulses. Our experimental method has the advantage that, in one reflectivity experiment, we can probe electronic structure as well as magnetism. BaFeO 2.5 thin films were grown on SrTiO 3 (00...

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“…This clearly shows that the magnetism in graphene is carried by the π-orbitals. The appearance of magnetic signals even far below the π*-resonance is explained by the typical enhancement of magnetic signals in reflection spectroscopy at low reflectance values due to normalization [16]. Exactly this is the case for carbon showing small R G below the π*-resonance [17].…”

Section: Resultsmentioning

confidence: 93%

Magneto-optical reflection spectroscopy on graphene/Co in the soft x-ray range

Mertins

Jansing

Gilbert

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. The existence of ferromagnetic ordering in graphene on cobalt is demonstrated by means of resonant magnetic reflection spectroscopy exploiting the transversal magneto-optical Kerr-effect (T-MOKE). Using linearly polarized synchrotron radiation in the soft x-ray range with energies spanning the carbon 1s edge, the π-and σ-bonds of graphene were excited individually, showing that magnetism in graphene is carried by the π -orbitals. Magnetic signals were detected over a wide energy range from 257 -340 eV with a T-MOKE peak value of 1.1 % at the π -resonance energy near 285 eV. By comparison with corresponding spectra measured at the 2p edges of the Co substrate, a large induced magnetic moment of 0.14 B  was derived for graphene. Individual hysteresis curves monitored at the Co 2p and C 1s edges show that the carbon magnetism is induced by the Co substrate.

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Resonant magnetic reflection coefficients at the Fe2pedge obtained with linearly and circularly polarized soft x rays

Cited by 54 publications

References 44 publications

Antiferromagnetic dipolar ordering in[Co2MnGe∕V]Nmultilayers

Antiferromagnetic dipolar ordering in[Co2MnGe∕V]Nmultilayers

Photoinduced Demagnetization and Insulator-to-Metal Transition in Ferromagnetic InsulatingBaFeO3Thin Films

Magneto-optical reflection spectroscopy on graphene/Co in the soft x-ray range

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