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SUMMARY:Sir Martin Wood Prize Lecture - Dr Masamitsu Hayashi - Dr Masamits
 u HayashiSir Martin Wood Prize Lecture
DTSTART:20150610T130000Z
DTEND:20150610T140000Z
UID:TALK59634@talks.cam.ac.uk
CONTACT:Linda Whyles
DESCRIPTION:Strong spin-orbit effects in magnetic heterostructures with br
 oken structural inversion symmetry have opened new paradigms to control ma
 gnetic moments electrically[1\, 2]. An ultrathin magnetic layer sandwiched
  between a heavy metal layer and an insulating oxide layer form the base o
 f inversion symmetry broken magnetic heterostructures. In such structures\
 , extremely small current applied along the film plane can trigger magneti
 zation switching and domain wall motion[3\, 4]. Key to the power efficient
  magnetization control is the large spin-orbit coupling of the heterostruc
 ture. The strong spin orbit coupling constant of the heavy metal layer ena
 bles generation of large spin current that can impinge upon the magnetic l
 ayer to exert torque on the magnetic moments\, now commonly referred to as
  the spin-orbit torque. At interfaces\, spin orbit coupling can cause the 
 ultrathin magnetic layer to form a chiral magnetic structure\, via the Dzy
 aloshinskii-Moriya interaction\, that can be manipulated by the spin curre
 nt. We have studied the characteristics of spin-orbit torques in ultrathin
  magnetic heterostructures with magnetization oriented perpendicular to th
 e film plane[5]. The layer thickness and temperature dependence of the tor
 que are analyzed to illustrate the importance of unusual spin transmission
  at the interface of heavy metal and magnetic layers[6\, 7]. Current induc
 ed domain nucleation and domain wall motion in related structures will be 
 discussed in connection with the chiral magnetic texture[8] developed in m
 agnetic heterostructures. \n[1] I. M. Miron et al.\, Nature 476\, 189 (201
 1). \n[2] L. Liu et al.\, Science 336\, 555 (2012). \n[3] S. S. P. Parkin 
 et al.\, Science 320\, 190 (2008). \n[4] M. Hayashi et al.\, Science 320\,
  209 (2008). \n[5] J. Sinha et al.\, Appl. Phys. Lett. 102 242405 (2013). 
 \n[6] J. Kim et al.\, Nat. Mater. 12\, 240 (2013). \n[7] J. Kim et al.\, P
 hys. Rev. B 89\, 174424 (2014). \n[8] J. Torrejon et al.\, Nature Comm. 5\
 , 4655 (2014). \n\nDr Hayashi was awarded the Sir Martin Wood Prize at the
  Millennium Science Forum which took place at the British Embassy\, Tokyo\
 , November 2014.  The Millennium Science Forum was established in 1998 to 
 promote scientific exchange between Britain and Japan and recognise the wo
 rk of outstanding young Japanese researchers.  \nThe prize is named after 
 Sir Martin Wood\, Founder of Oxford Instruments.\n
LOCATION:Small Lecture Theatre (Bragg Building)\, Cavendish Laboratory
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