84 citations · 342 across the 14 of their papers we have counts for
14 papers
Sub-wavelength mid-infrared imaging of locally driven photocurrents using diamond campanile probes
Rajasekhar Medapalli, Nathan D. Cottam, Khushboo Agarwal +12
Precise and high efficiency concentration of mid-infrared (mid-IR) light into sub wavelength volumes is essential for probing low-energy excitations and achieving strong field enha…
Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation
Sheena K. K. Patel, Oleg Yu. Gorobtsov, Devin Cela +11
We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) order of a chromium film following photoexcitation with an ultrafast optical laser pulse. Th…
Ultrafast Emergence of Ferromagnetism in Antiferromagnetic FeRh in High Magnetic Fields
I. A. Dolgikh, T. G. H. Blank, A. G. Buzdakov +11
Ultrafast heating of FeRh by a femtosecond laser pulse launches a magneto-structural phase transition from an antiferromagnetic to a ferromagnetic state. Aiming to reveal the ultra…
Inertial spin dynamics in epitaxial cobalt films
Vivek Unikandanunni, Rajasekhar Medapalli, Marco Asa +5
We investigate the spin dynamics driven by terahertz magnetic fields in epitaxial thin films of cobalt in its three crystalline phases. The terahertz magnetic field generates a tor…
Magnetic imaging and statistical analysis of the metamagnetic phase transition of FeRh with electron spins in diamond
Guillermo Nava Antonio, Iacopo Bertelli, Brecht G. Simon +3
Magnetic imaging based on nitrogen-vacancy (NV) centers in diamond has emerged as a powerful tool for probing magnetic phenomena in fields ranging from biology to physics. A key st…
Dynamic symmetry breaking in chiral magnetic systems
Jeffrey A. Brock, Michael D. Kitcher, Pierre Vallobra +6
The Dzyaloshinskii-Moriya interaction (DMI) in magnetic systems stabilizes spin textures with preferred chirality, applicable to next-generation memory and computing architectures.…
Phonon-assisted formation of an itinerant electronic density wave
Jiaruo Li, Oleg Yu. Gorobtsov, Sheena K. K. Patel +13
Electronic instabilities drive ordering transitions in condensed matter. Despite many advances in the microscopic understanding of the ordered states, a more nuanced and profound q…
Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt
Vivek Unikandanunni, Rajasekhar Medapalli, Eric E. Fullerton +3
We investigate the ultrafast spin dynamics in an epitaxial hcp(1100) cobalt thin film. By performing pump-probe magneto-optical measurements with the magnetization along either the…
Femtosecond Photocurrents at the Pt/FeRh Interface
Rajasekhar Medapalli, Guanqiao Li, Sheena K. K. Patel +4
Femtosecond laser excitation of FeRh/Pt bilayers launches an ultrafast pulse of electric photocurrent in the Pt-layer and thus results in emission of electromagnetic radiation in t…
Ultrafast kinetics of the antiferromagnetic-ferromagnetic phase transition in FeRh
G. Li, R. Medapalli, J. H. Mentink +7
Understanding how fast short-range interactions build up long-range order is one of the most intriguing topics in condensed matter physics. FeRh is a test specimen for studying thi…
THz emission from Co/Pt bilayers with varied roughness, crystal structure, and interface intermixing
G. Li, R. Medapalli, R. V. Mikhaylovskiy +4
Femtosecond laser excitation of a Co/Pt bilayer results in the efficient emission of picosecond THz pulses. Two known mechanisms for generating THz emission are spin-polarized curr…
Helicity-dependent all-optical domain wall motion in ferromagnetic thin films
Y. Quessab, R. Medapalli, M. S. El Hadri +4
Domain wall displacement in Co/Pt thin films induced by not only fs- but also ps-laser pulses is demonstrated using time-resolved magneto-optical Faraday imaging. We evidence multi…
Mechanism of all-optical control of ferromagnetic multilayers with circularly polarized light
Rajasekhar Medapalli, Dymtro Afanasiev, Dokyun Kim +6
Time-resolved imaging reveals that the helicity dependent all-optical switching (HD-AOS) of Co/Pt ferromagnetic multilayers proceeds by two stages. First one involves the helicity…
Accumulative magnetic switching of ultra-high-density recording media by circularly polarized light
Y. K. Takahashi, R. Medapalli, S. Kasai +6
Manipulation of the magnetization by external energies other than magnetic field, such as spin-polarized current1-4, electric voltage5,6 and circularly polarized light7-11 gives a…