Ultrafast dynamics of Au/TmIG and Au/YIG bilayers in response to picosecond heating (Conference Presentation)

Richard Wilson; Michael Gomez; Yawen Liu; Jing Shi

doi:10.1117/12.2321986

18 September 2018 Ultrafast dynamics of Au/TmIG and Au/YIG bilayers in response to picosecond heating (Conference Presentation)

Richard Wilson, Michael Gomez, Yawen Liu, Jing Shi

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107322U (2018) https://doi.org/10.1117/12.2321986
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Ultrafast control of magnetic order in materials requires a fundamental understanding of how energy and angular momentum flow between electronic, magnetic, and vibrational degrees-of-freedom. We investigate the ultrafast response of Au/TmIG and Au/YIG bilayers to ultrafast laser heating of the Au electrons. In the picoseconds after heating, large interfacial spin currents occur due to a temperature imbalance between electrons and phonons in the metal, and magnons and phonons in the magnetic insulator. We utilize four different optical probes to develop a complete picture of the heat and spin transport in Au/TmIG and Au/YIG. Magneto-optic Kerr effect measurements of Au at a wavelength of 800 nm detects the spin accumulation in the normal metal that results from interfacial spin-currents. Magneto-optic Kerr effect measurements at 400 nm monitor the ultrafast magnetization dynamics of the garnet insulator that occur due to increases in magnon population. Finally, thermoreflectance measurements at 690 and 950 nm monitor the temperature evolution of the Au electrons and phonons, respectively. Together, these measurements allow us to estimate the magnitude of the transport coefficients responsible for the longitudinal spin-Seebeck effect in these systems. These coefficients include the electron-magnon conductance of the Au/TmIG and Au/YIG interfaces, the electron-phonon coupling in the Au layer, and the magnon-phonon coupling in the TmIG and YIG layers.

Conference Presentation

Citation Download Citation

Richard Wilson, Michael Gomez, Yawen Liu, and Jing Shi "Ultrafast dynamics of Au/TmIG and Au/YIG bilayers in response to picosecond heating (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107322U (18 September 2018); https://doi.org/10.1117/12.2321986

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available