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@PHDTHESIS{Zhou:139787,
      author       = {Zhou, Xianzhong},
      title        = {{T}emperature-{I}nduced {M}etamagnetic {T}ransition and
                      {D}omain {S}tructures of {S}ingle-{C}rystalline {F}e{R}h
                      {T}hin {F}ilms on {M}g{O}(100)},
      volume       = {76},
      school       = {Universität Köln},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2013-05759},
      isbn         = {978-3-89336-919-5},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {XI, 104 S.},
      year         = {2013},
      note         = {Universität Köln, Diss., 2013},
      abstract     = {Exchange systems of FeRh with a hard magnetic layer are a
                      promising approach for heat-assisted magnetic recording that
                      can largely increase the storage density of hard disk
                      drives. The FeRh alloy is known to undergo a
                      temperature-induced metamagnetic transition from
                      antiferromagnetic (AFM) to ferromagnetic (FM) just above the
                      room temperature. But the AFM and FM phases coexist across
                      the transition in single-crystalline FeRh thin lms with thin
                      capping layers (e.g. Au, Al, or MgO). In order to
                      investigate the intrinsic surface magnetic properties,
                      single-crystalline FeRh films without capping layer are
                      prepared by two kinds of experimental procedures. For the
                      ex-situ sample preparation procedure, two 40nm thick,
                      single-crystalline FeRh films are prepared on MgO(100) by
                      separate layer deposition of Fe and Rh. X-ray photoemission
                      spectroscopy (XPS) immediately after the deposition shows
                      that one sample is Rh-rich and the other Fe-rich. The
                      samples are exposed to air and transferred to a second
                      ultra-high vacuum (UHV) system to perform the magnetic
                      characterization. This transfer results in a contamination
                      by C and O. After surface cleaning by high-temperature
                      annealing the Rh-rich sample is still slightly contaminated
                      with C, while the Fe-rich surface is oxidized.
                      Magneto-optical Kerr effect (MOKE) measurements reveal that
                      only the Rh-rich sample shows the metamagnetic transition
                      below room temperature. The Fe-rich sample is FM at 193 and
                      293 K. Scanning electron microscopy with polarization
                      analysis (SEMPA) reveals that the Rh-rich surface is FM at
                      all temperatures between 160 and 450K although the bulk is
                      AFM below room temperature. For the in-situ sample
                      preparation procedure, a 10nm single-crystalline FeRh film
                      is prepared on MgO(100) again by separate layer deposition
                      of Fe and Rh but now in the same UHV system as all
                      characterizations. Thus, the intrinsic properties of the
                      single-crystalline FeRh film are investigated without
                      exposure to air and additional cleaning steps. The in-situ
                      prepared FeRh lm also exhibits the metamagnetic phase
                      transition below room temperature as indicated by MOKE. The
                      temperature dependent domain structure obtained by SEMPA
                      reveals that FM domains exist at the surface while the bulk
                      is AFM. In contrast to the ex-situ prepared sample the
                      domain size changes drastically at the transition
                      temperature. This is related to a spin reorientation
                      transition from out-of-plane to in-plane between 350 to 400
                      K. The results show that the previously observed coexistence
                      of the FM state at the surface and the AFM phase in the bulk
                      is not due to an artifact of capping layers or surface
                      contamination. This coexistence is shown in this work to be
                      an intrinsic property of (100) surfaces of
                      single-crystalline FeRh thin films on MgO(100).},
      keywords     = {Dissertation (GND)},
      cin          = {PGI-6},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {422 - Spin-based and quantum information (POF2-422)},
      pid          = {G:(DE-HGF)POF2-422},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/139787},
}