Femtosecond X-ray magnetic circular dichroism absorption spectroscopy at an X-ray free electron laser.

X-ray magnetic circular dichroism spectroscopy using an X-ray free electron laser is demonstrated with spectra over the Fe L(3,2)-edges. The high brightness of the X-ray free electron laser combined with high accuracy detection of incident and transmitted X-rays enables ultrafast X-ray magnetic circular dichroism studies of unprecedented sensitivity. This new capability is applied to a study of all-optical magnetic switching dynamics of Fe and Gd magnetic sublattices in a GdFeCo thin film above its magnetization compensation temperature.

[1]  König,et al.  Determination of spin- and orbital-moment anisotropies in transition metals by angle-dependent x-ray magnetic circular dichroism. , 1995, Physical review letters.

[2]  B. McNeil,et al.  X-ray free-electron lasers , 2010 .

[3]  W. Schlotter,et al.  Polarization control in an X-ray free-electron laser , 2016, Nature Photonics.

[4]  E. Beaurepaire,et al.  Ultrafast angular momentum transfer in multisublattice ferrimagnets , 2014, Nature Communications.

[5]  Y. Fainman,et al.  All-optical control of ferromagnetic thin films and nanostructures , 2014, Science.

[6]  Wilfried Wurth,et al.  Near edge x-ray absorption fine structure spectroscopy with x-ray free-electron lasers , 2009 .

[7]  Andrei Kirilyuk,et al.  Laser-induced magnetization dynamics and reversal in ferrimagnetic alloys , 2013, Reports on progress in physics. Physical Society.

[8]  Regina Soufli,et al.  Linac Coherent Light Source soft x-ray materials science instrument optical design and monochromator commissioning. , 2011, The Review of scientific instruments.

[9]  M. Cinchetti,et al.  Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. , 2010, Nature materials.

[10]  G. Mercurio,et al.  Probing the transition state region in catalytic CO oxidation on Ru , 2015, Science.

[11]  Akio Kotani,et al.  Core Level Spectroscopy of Solids , 2008 .

[12]  D. Legut,et al.  Influence of laser-excited electron distributions on the X-ray magnetic circular dichroism spectra: Implications for femtosecond demagnetization in Ni , 2009, 0906.1700.

[13]  M. V. Yurkov,et al.  Statistical and coherence properties of radiation from x-ray free-electron lasers , 2009, 0912.4161.

[14]  W. Eberhardt,et al.  Femtosecond modification of electron localization and transfer of angular momentum in nickel. , 2007, Nature materials.

[15]  L. Juha,et al.  The soft x-ray instrument for materials studies at the linac coherent light source x-ray free-electron laser. , 2012, The Review of scientific instruments.

[16]  L. Christophorou.  Science , 2018, Emerging Dynamics: Science, Energy, Society and Values.

[17]  H. Wen,et al.  Probing the hydrogen-bond network of water via time-resolved soft X-ray spectroscopy. , 2009, Physical chemistry chemical physics : PCCP.

[18]  Scott Metzler,et al.  Nuclear Science Symposium Medical Imaging Conference , 2002 .

[19]  W. Schlotter,et al.  Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo. , 2013, Nature materials.

[20]  A. Khorsand,et al.  Efficiency of ultrafast laser-induced demagnetization in Gd x Fe 100-x-y Co y alloys , 2012 .

[21]  Georg Weidenspointner,et al.  Femtosecond X-ray protein nanocrystallography , 2011, Nature.

[22]  U Arp,et al.  Absolute pulse energy measurements of soft x-rays at the Linac Coherent Light Source. , 2014, Optics express.

[23]  H. Padmore,et al.  First commissioning results for the elliptically polarizing undulator beamline at the Advanced Light Source , 2001 .

[24]  M. Wolf,et al.  Real-Time Observation of Surface Bond Breaking with an X-ray Laser , 2013, Science.

[25]  S Fourmaux,et al.  Band-selective measurements of electron dynamics in VO2 using femtosecond near-edge x-ray absorption. , 2005, Physical review letters.

[26]  M. Cinchetti,et al.  Engineered materials for all-optical helicity-dependent magnetic switching. , 2014, Nature materials.

[27]  D. Ratner,et al.  First lasing and operation of an ångstrom-wavelength free-electron laser , 2010 .

[28]  T. Rasing,et al.  All-optical magnetic recording with circularly polarized light. , 2007, Physical review letters.

[29]  Catherine Graves,et al.  Femtosecond single-shot imaging of nanoscale ferromagnetic order in Co/Pd multilayers using resonant x-ray holography. , 2012, Physical review letters.

[30]  R. Rosenfeld.  Nature , 2009, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.

[31]  H. Dürr,et al.  Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins , 2011, Nature.

[32]  Joachim Stöhr,et al.  Magnetism From Fundamentals to Nanoscale Dynamics , 2006 .

[33]  Stuart S. P. Parkin,et al.  Control of the metal–insulator transition in vanadium dioxide by modifying orbital occupancy , 2013, Nature Physics.

[34]  Peter Denes,et al.  A 1MPixel fast CCD sensor for X-ray imaging , 2012, 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC).