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SUMMARY:Real-space observation of chiral magnetic order in metallic thin f
 ilm at room temperature
DTSTART:20110818T140000
DTSTAMP:20260427T200113Z
UID:ad09ba807ae240e9466a42d3862b9a0b6cafca8b0195d8b473864f75
CATEGORIES:Conferences - Seminars
DESCRIPTION:Y.Z. Wu\, Department of Physics\, State Key Laboratory of Surf
 ace Physics\, and Advanced Materials Laboratory\, Fudan University\,\nMagn
 etic domain  usually considered as the result of the competition of the ex
 change interaction  the dipolar interaction and the magnetic anisotropy  w
 ill not contain the chiral order. \nHowever  the Dzyaloshinskii-Moriya (DM
 ) interaction  which arises from the spin-orbit scattering of electrons \n
 in a system with the broken inversion symmetry  will cause the chiral magn
 etic order. \nThe Chiral spin structures were observed in the helimagnets 
 like Fe0.5Co0.5Si \nwith a non-centrosymmetric crystal structure (Uchida e
 t. al  Science  311  359(2006)  Yu et. al  Nature  465  901(2010))  \nand 
 in a Mn atomic layer on a tungsten substrate with the inversion symmetry b
 roken at the interface (Bode et. al  Nature  447 190(2007)). \nChirality i
 n Nano scale magnets may play a crucial role in spintronic devices  but it
  should be realized at room temperature for real applications.\nIn this ta
 lk  we will present our results on the chiral magnetic order in Fe/Ni bila
 yer directly observed in real space at room temperature. \nThe experiments
  were performed with the spin polarized low-energy electron microscopy (SP
 LEEM) in Lawrence Berkeley national laboratory. \nThe SPLEEM can image the
  magnetic domain with the magnetization along the arbitrary orientations  
 \nwhich allows us to map the spin structure directly in real space. The Fe
 /Ni bilayer grown on Cu(001) exhibits the magnetic stripe domain phase. \n
 The domain wall of the magnetic stripe is Néel-type which is different wi
 th all the previous theoretic predictions  \nand the in-plane components o
 f the neighboring domain walls are always antiparallel. \nThose results cl
 early demonstrate the existing of the cycloidal chiral magnetic order when
  the magnetic spins rotate. \nThe chiral order in the Fe/Ni bilayer is ind
 ependent of the orientation and the width of the magnetic stripes  but wil
 l disappear for the Ni layer thicker than 7ML. \nThe chirality can switch 
 from the right-hand cycloid in Fe/Ni/Cu(001) to the left-hand cycloid in N
 i/Fe/Cu(001)  \nwhich indicates the chirality is caused by the DM interact
 ion mainly locating at the Fe/Ni interface. \nThe Monte-Carlo simulation c
 an fully explain our results  and also predicts a new type of the skyrmion
  spin structure. \nOur results provide a new way to enhance the DMI at roo
 m temperature  which will benefit the application of the spintronic device
 s.\n\nWork in collaboration with G.Chen  J.Zhu  A.Quesada  J.Li  A.N’Dia
 ye  Y.Huo  T.P.Ma  Y.Chen  H.Y.Kwon  C.Won  Z.Q.Qiu  A.K.Schmid
LOCATION:PH H3 31
STATUS:CONFIRMED
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