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CATEGORIES:Thin Film Magnetism Group Seminars
SUMMARY:Effective field measurements and spin torque dynam
 ics in magnetic nanostuctures - The Sir martin Woo
 d Lecture Prize - Dr Masamitsu Hayashi\, National 
 Institute of Materials Science\, Tsukuba\, Japan
DTSTART;TZID=Europe/London:20150610T140000
DTEND;TZID=Europe/London:20150610T150000
UID:TALK59808AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/59808
DESCRIPTION:Strong spin-orbit effects in magnetic heterostruct
 ures with broken structural inversion symmetry hav
 e opened new paradigms to control magnetic moments
  electrically[1\, 2]. An ultrathin magnetic layer 
 sandwiched between a heavy metal layer and an insu
 lating oxide layer form the base of inversion symm
 etry broken magnetic heterostructures. In such str
 uctures\, extremely small current applied along th
 e film plane can trigger magnetization switching a
 nd domain wall motion[3\, 4]. Key to the power eff
 icient magnetization control is the large spin-orb
 it coupling of the heterostructure. The strong spi
 n orbit coupling constant of the heavy metal layer
  enables generation of large spin current that can
  impinge upon the magnetic layer to exert torque o
 n the magnetic moments\, now commonly referred to 
 as the spin-orbit torque. At interfaces\, spin orb
 it coupling can cause the ultrathin magnetic layer
  to form a chiral magnetic structure\, via the Dzy
 aloshinskii-Moriya interaction\, that can be manip
 ulated by the spin current. We have studied the ch
 aracteristics of spin-orbit torques in ultrathin m
 agnetic heterostructures with magnetization orient
 ed perpendicular to the film plane5. The layer thi
 ckness and temperature dependence of the torque ar
 e analyzed to illustrate the importance of unusual
  spin transmission at the interface of heavy metal
  and magnetic layers[6\, 7]. Current induced domai
 n nucleation and domain wall motion in related str
 uctures will be discussed in connection with the c
 hiral magnetic texture8 developed in magnetic hete
 rostructures. [1] I. M. Miron et al.\, Nature 476\
 , 189 (2011). [2] L. Liu et al.\, Science 336\, 55
 5 (2012). [3] S. S. P. Parkin et al.\, Science 320
 \, 190 (2008). [4] M. Hayashi et al.\, Science 320
 \, 209 (2008). [5] J. Sinha et al.\, Appl. Phys. L
 ett. 102 242405 (2013). [6] J. Kim et al.\, Nat. M
 ater. 12\, 240 (2013). [7] J. Kim et al.\, Phys. R
 ev. B 89 \, 174424 (2014). [8] J. Torrejon et al.\
 , Nature Comm. 5\, 4655 (2014).\n\nDr Hayashi was 
 awarded the Sir Martin Wood Prize at the Millenniu
 m Science Forum which took place at the British Em
 bassy\, Tokyo\, November 2014. The Millennium Scie
 nce Forum was established in 1998 to promote scien
 tific exchange between Britain and Japan and recog
 nise the work of outstanding young Japanese resear
 chers. The prize is named after Sir Martin Wood\, 
 Founder of Oxford Instruments.
LOCATION:Small Lecture Theatre (Bragg Building)\, Cavendish
  Laboratory
CONTACT:Linda Whyles
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