Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa9e43
Keywords
terahertz (THz) radiation; spin current; inverse spin Hall effect
Categories
Funding
- National Natural Science Foundation of China (NSFC) [11604202, 11674213, 61735010, 51671057, 11474067]
- National Basic Research Program of China [2014CB921104]
- Shanghai Municipal Education Commission [16CG45, ZZSD15098]
- Shanghai Education Development Foundation
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We report the broadband terahertz (THz) radiation in the metallic ferromagnetic (FM) heterostructures, upon irradiation of a femtosecond laser pulse at room temperature. The origin of THz generation from FM heterostructures can be interpreted using two terms: the transient demagnetization (a local modification of spin order of the FM metal) and electric-dipole radiation resulting from a non-local spin current pulses. Here, we show that the THz emission is dominated by the photo-excited transient charge current, which is converted from the spin current with inverse spin Hall effect. We tailor the metallic heterostructures with different non-magnetic thin layer (Pd or Ru) and FM materials (CoFeB or CoFe), to shape the THz transients. Moreover, we find that a saturation effect of THz radiation for CoFeB/Pd is less compared to CoFcB/Ru. THz emission spectroscopy can be used to qualitatively visualize the spin accumulation in the heterostructures.
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