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@INPROCEEDINGS{SyedMohd:859552,
      author       = {Syed Mohd, Amir and Pütter, Sabine and Mattauch, Stefan
                      and Koutsioumpas, Alexandros and Geprägs, Stephan and
                      Brückel, Thomas},
      title        = {{M}agnetic structure in epitaxial {F}e/{C}u and
                      {F}e/{F}e{P}t multilayers {P}robed by {P}olarised {N}eutron
                      {R}eflectivity},
      reportid     = {FZJ-2019-00404},
      year         = {2015},
      abstract     = {The study of exchange coupling effect between magnetic thin
                      films is important due to the underlying fundamental Physics
                      and possibility to develop functional nanostructures for
                      their potential use in memory devices and sensors. This
                      effect results in interlayer coupling (e.g.
                      antiferromagnetic or biquadratic) between ferromagnetic film
                      separated by a non- magnetic metal or semiconductor film
                      [1-3]. The exchange coupling also emerges as exchange spring
                      effect when soft ferromagnetic film (e.g. Fe or Permalloy)
                      is coupled with hard ferromagnetic film (e.g. L10-FePt) [4].
                      It has been demonstrated theoretically that in case of
                      exchange spring effect, magnetization of soft ferromagnet is
                      pinned at the interface and form a spiral structure under
                      external magnetic field [5]. It is in fact difficult to
                      obtain the magnetic profile in exchange coupled multilayers
                      using conventional magnetometric technique such as SQUID or
                      MOKE. However, polarised neutron reflectivity (PNR)
                      technique is unique to obtain depth dependent magnetization
                      structure in magnetic thin films and multilayers. In this
                      work we intend to use PNR technique to probe the
                      magnetization structure in Fe layers in epitaxial Fe/Cu and
                      Fe/FePt multilayers prepared using molecular beam epitaxy
                      (MBE).We have deposited [Fe(1.5 nm)/Cu(2.5 nm)]10 multilayer
                      on Cu (100) buffer layer epitaxially grown on Si (100)
                      substrate at ~280 K. In-situ reflection high energy electron
                      diffraction (RHEED) measurements were performed during
                      deposition to monitor the epitaxial growth. SQUID together
                      with PNR measurements were done to probe the interlayer
                      coupling and magnetization structure. The temperature
                      dependent SQUID measurement rules out the antiferromagnetic
                      coupling between Fe layers. PNR measurements were performed
                      at saturation, and after decreasing the field close to
                      remanence. The spin flip PNR measurement around remnant
                      reveals that magnetization in Fe layer is non-collinear.In
                      order to study the exchange spring behaviour in Fe/FePt
                      multilayers, first we deposited epitaxial FePt thin films on
                      MgO(100) substrate at ~500 K. Ex-situ x-ray diffraction
                      measurement confirms the L10 structure of the FePt film
                      which has hard magnetic behaviour [6]. PNR measurements on
                      Fe/FePt multilayers are underway, and the results of Fe/Cu
                      and Fe/FePt multilayers will be discussed in the
                      presentation.AcknowledgmentsI, SYED MOHD A., acknowledge the
                      help received from Harald Schneider and Alexandra Steffen.
                      References1. Grünberg P., Schreiber R., Pang Y., Brodsky M.
                      B., and Sowers H., Phys. Rev. Lett. 57, 2442, (1986).2. Vaz
                      C. A. F., Bland J. A. C., Lauhoff G., Rep. Prog. Phys. 71,
                      056501, (2008).3. Strijkers G. J., Kohlhepp J. T., Swagten
                      H. J. M., and de Jonge W. J. M., Phys. Rev. Lett. 84,
                      1812,(2000).4. Fullerton E. E., Jiang J. S., Grimsditch M.,
                      Sowers C. H., and Bader S. D., Phys. Rev. B 58,
                      12193,(1998).5. Asti G., Ghidini M., Pellicelli R.,
                      Pernechele C., Solzi M., Albertini F., Casoli F., Fabbrici
                      S., ParetiL., Phys. Rev. B 73, 094406, (2008).6. Skomski R.,
                      Manchanda P., Kumar P., Balamurugan B., Kashyap A., and
                      Sellmyer D. J., IEEE 49,3215, (2013).},
      month         = {Jul},
      date          = {2015-07-12},
      organization  = {22nd International Colloquium on
                       magnetic films and surfaces, Krakow
                       (Poland), 12 Jul 2015 - 17 Jul 2015},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / PGI-4 / JCNS-2},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 6G15 - FRM II / MLZ
                      (POF3-6G15) / 6G4 - Jülich Centre for Neutron Research
                      (JCNS) (POF3-623) / 524 - Controlling Collective States
                      (POF3-524)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-524},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210 / EXP:(DE-MLZ)MARIA-20140101},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/859552},
}