Zobrazeno 1 - 10
of 467
pro vyhledávání: '"Kampfrath, T"'
Autor:
Chekhov, A. L., Behovits, Y., Martens, U., Serrano, B. R., Wolf, M., Seifert, T. S., Muenzenberg, M., Kampfrath, T.
We demonstrate detection of broadband intense terahertz electromagnetic pulses by Zeeman-torque sampling (ZTS). Our approach is based on magneto-optic probing of the Zeeman torque the terahertz magnetic field exerts on the magnetization of a ferromag
Externí odkaz:
http://arxiv.org/abs/2306.09734
Autor:
Rouzegar, R., Wahada, M. A., Chekhov, A. L., Hoppe, W., Jechumtal, J., Nadvornik, L., Wolf, M., Seifert, T. S., Parkin, S. S. P., Woltersdorf, G., Brouwer, P. W., Kampfrath, T.
We study femtosecond spin currents through MgO tunneling barriers in CoFeB(2 nm)|MgO($d$)|Pt(2 nm) stacks by terahertz emission spectroscopy. To obtain transport information independent of extrinsic experimental factors, we determine the complex-valu
Externí odkaz:
http://arxiv.org/abs/2305.09074
Autor:
Rongione, E., Gueckstock, O., Mattern, M., Gomonay, O., Meer, H., Schmitt, C., Ramos, R., Saitoh, E., Sinova, J., Jaffrès, H., Mičica, M., Mangeney, J., Goennenwein, S. T. B., Geprägs, S., Kampfrath, T., Kläui, M., Bargheer, M., Seifert, T. S., Dhillon, S., Lebrun, R.
Antiferromagnetic materials have been proposed as new types of narrowband THz spintronic devices owing to their ultrafast spin dynamics. Manipulating coherently their spin dynamics, however, remains a key challenge that is envisioned to be accomplish
Externí odkaz:
http://arxiv.org/abs/2205.11965
Autor:
Schumann, T., Kleinke, T., Braun, L., Meyer, N., Mussler, G., Kampmeier, J., Grützmacher, D., Schmoranzerova, E., Olejník, K., Reichlová, H., Heiliger, C., Denker, C., Walowski, J., Kampfrath, T., Münzenberg, M.
We study laser driven spin-current effects at ferromagnet/topological-insulator interfaces by two complementary experimental approaches. The DC photocurrent is studied in ferromagnet/topological-insulator bilayers with high spatial resolution. Dynami
Externí odkaz:
http://arxiv.org/abs/2202.01522
Autor:
Heitz, J. J. F., Nádvorník, L., Balos, V., Behovits, Y., Chekhov, A. L., Seifert, T. S., Olejník, K., Kašpar, Z., Geishendorf, K., Novák, V., Campion, R. P., Wolf, M., Jungwirth, T., Kampfrath, T.
We show scalable and complete suppression of the recently reported terahertz-pulse-induced switching between different resistance states of antiferromagnetic CuMnAs thin films by ultrafast gating. The gating functionality is achieved by an optically
Externí odkaz:
http://arxiv.org/abs/2106.08828
Autor:
Chekhov, A. L., Behovits, Y., Heitz, J. J. F., Denker, C., Reiss, D. A., Wolf, M., Weinelt, M., Brouwer, P. W., Münzenberg, M., Kampfrath, T.
We study ultrafast magnetization quenching of ferromagnetic iron following excitation by an optical vs a terahertz pump pulse. While the optical pump (photon energy of 3.1 eV) induces a strongly nonthermal electron distribution, terahertz excitation
Externí odkaz:
http://arxiv.org/abs/2106.01967
Autor:
Rouzegar, R., Brandt, L., Nadvornik, L., Reiss, D. A., Chekhov, A. L., Gueckstock, O., In, C., Wolf, M., Seifert, T. S., Brouwer, P. W., Woltersdorf, G., Kampfrath, T.
Laser-induced terahertz spin transport (TST) and ultrafast demagnetization (UDM) are central but so far disconnected phenomena in femtomagnetism and terahertz spintronics. Here, we use broadband terahertz emission spectroscopy to reliably measure bot
Externí odkaz:
http://arxiv.org/abs/2103.11710
Autor:
Schumann, T., Meyer, N., Mussler, G., Kampmeier, J., Grützmacher, D., Schmoranzerova, E., Braun, L., Kampfrath, T., Walowski, J., Münzenberg, M.
The theoretical prediction of topological insulators in 2007 triggered tremendous interest. They are of fundamental interest because of their topological twist in k-space, which comes along with unidirectional, spin-polarized surface-state currents,
Externí odkaz:
http://arxiv.org/abs/1810.12799
Autor:
Herapath, Rosamund I., Hornett, Sam M., Seifert, T., Jakob, Gerhard, Kläui, Mathias, Bertolotti, Jacopo, Kampfrath, T., Hendry, Euan
We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic Fe layer between adjacent nonmagnetic W and Pt layers. We find that the efficiency of THz generation
Externí odkaz:
http://arxiv.org/abs/1808.00746
Autor:
Wang, Zhe, Kovalev, S., Awari, N., Chen, Min, Germanskiy, S., Green, B., Deinert, J. -C., Kampfrath, T., Milano, J., Gensch, M.
Publikováno v:
Appl. Phys. Lett. 112, 252404 (2018)
We report on measurements of magnetic field and temperature dependence of antiferromagnetic resonances in the prototypical antiferromagnet NiO. The frequencies of the magnetic resonances in the vicinity of 1 THz have been determined in the time-domai
Externí odkaz:
http://arxiv.org/abs/1806.07968