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UID:DSC-22870
DTSTART;TZID=Europe/Berlin:20260506T140000
SEQUENCE:1778045820
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20260506T150000
URL:https://dresden-science-calendar.de/calendar/de/detail/22870
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Kuschel: Higher-order magnetooptic Kerr effect in magnetic thin fil
 ms
CLASS:PUBLIC
DESCRIPTION:Speaker: PD Dr. Timo Kuschel\nInstitute of Speaker: Institute o
 f Physics\, Johannes Gutenberg University Mainz\nTopics:\n\n Location:\n  
 Name: IFW (B3E.26\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 0
 1069 Dresden\n  Phone: \n  Fax: \nDescription: The magneto-optic Kerr effe
 ct (MOKE) describes the change of polarization state apon reflection of po
 larized light from a magnetized sample [1]. Initially\, this effect has be
 en assumed to be proportional to the magnetization M of the investigated s
 ample and\, thus\, became a standard tool to study magnetic thin-film syst
 ems\, e.g. via Kerr spectroscopy\, time-resolved MOKE\, or Kerr imaging [2
 \,3].  However\, in the last two decades contributions of second order in 
 M have been explored [4]. The so-called quadratic MOKE (QMOKE) is proporti
 onal to M2 and can be utilized\, e.g.\, to study antiferromagnetic materia
 ls [5] since the MOKE linear in M vanishes here due to the antiparallel al
 ignment of the magnetic moments. Recently\, we have identified MOKE contri
 butions of third order in magnetization (cubic MOKE\, CMOKE) being proport
 ional to M3 [6] and studied its dependence on the structural domain twinni
 ng of Ni(111) thin films characterized by off-specular x-ray diffraction m
 appings.  In my talk\, I will introduce higher-order MOKE effects and disc
 uss recent examples. We have investigated the QMOKE in Fe [7] and Heusler 
 compound thin films [8]\, and confirmed the linear dependence of the QMOKE
  on the structural order of the Heusler compound in a wide spectral range.
  We are able to describe the angular dependencies of QMOKE and CMOKE with 
 respect to the crystal orientation of the thin films. For example\, while 
 it is quite simple to find CMOKE in (111)-oriented films\, it is not strai
 ghtforward to identify it in (001)-oriented samples [9]. I will discuss th
 e reasons. Finally\, I will show that the CMOKE in Co(111) thin films can 
 reach up to 30% of the linear MOKE signal [10] which is promissing for fut
 ure research applications such as CMOKE microscopy\, spectroscopy and pump
  probe experiments.
DTSTAMP:20260531T224309Z
CREATED:20260430T053532Z
LAST-MODIFIED:20260506T053700Z
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