BEGIN:VCALENDAR
VERSION:2.0
PRODID:www.dresden-science-calendar.de
METHOD:PUBLISH
CALSCALE:GREGORIAN
X-MICROSOFT-CALSCALE:GREGORIAN
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZNAME:CEST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19810329T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:DSC-9019
DTSTART;TZID=Europe/Berlin:20150323T090000
SEQUENCE:1427097666
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20150323T100000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/9019
LOCATION:MPI-CPfS\, Nöthnitzer Straße 4001187 Dresden
SUMMARY:Pushp: Probing magnetism with magnetic field\, current and heat
CLASS:PUBLIC
DESCRIPTION:Speaker: Aakash Pushp\, IBM Alamden Research Center\, San Jose\
 , CA\, USA\nInstitute of Speaker: \nTopics:\nChemie\, Physik\, Materialien
 \n Location:\n  Name: MPI-CPfS (Seminarraum 1+2\, Nöthnitzer Straße 40\,
  01187 Dresden)\n  Street: Nöthnitzer Straße 40\n  City: 01187 Dresden\n
   Phone: \n  Fax: \nDescription: Systems exhibiting long-range order\, for
  example\, superconductivity\, magnetism\, ferroelectrics\, liquid crystal
 s\, etc have been of significant interest in condensed matter physics. Pro
 bing and manipulating the response of the ensuing order parameters of such
  systems with external stimuli not only reveals novel physics but also can
  have a major technological impact. In this talk\, I will concentrate on m
 agnetism and address three different ways of manipulating the magnetic ord
 er parameter of various systems by magnetic field\, (charge and spin) curr
 ent and heat while delving into the underlying physics and discussing thei
 r potential towards new and promising spin based technologies.  In the fir
 st part\, using the theory of topological defects\, I will discuss how one
  can understand and control the trajectory of domain walls in in-plane mag
 netized branched networks\, composed of connected nanowires\, by a conside
 ration of their fractional elementary topological defects and how they int
 eract with those innate to the network. Using these concepts\, I'll unrave
 l the microscopic origin of the one-dimensional (1D) nature of magnetizati
 on reversal of artificial spin ice systems that have been observed in the 
 form of Dirac strings.  In the second part\, I will show a novel way of in
 jecting domain walls in out-of-plane magnetized nanowires using spin trans
 fer torque (STT) from nanosecond current pulses that cross a 90° magnetiz
 ation boundary\, which can be created\, for example\, by local ion irradia
 tion at specific sites along the nanowire.  Recently\, by taking advantage
  of the spin-dependent thermoelectric properties of magnetic materials\, n
 ovel means of generating spin currents from temperature gradients have bee
 n realized\, but so far their associated thermal spin torques (TSTs) have 
 not been large enough to influence magnetic tunnel junction (MTJ) switchin
 g. In the last part of my talk\, I will show evidence for significant TSTs
  in MTJs by generating large temperature gradients across ultrathin MgO tu
 nnel barriers. I will show that the TST strongly depends on the relative o
 rientation of the free and the reference layers of the MTJ and can be attr
 ibuted to an asymmetry of the tunneling conductance across the zero bias v
 oltage of the MTJ.
DTSTAMP:20260509T120608Z
CREATED:20150323T080106Z
LAST-MODIFIED:20150323T080106Z
END:VEVENT
END:VCALENDAR