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Akademický článek

Quantum watch and its intrinsic proof of accuracy

Autor: Marta Berholts, Ronny Knut, Robert Stefanuik, Hampus Wikmark, Susmita Saha, Johan Söderström

Publikováno v: Physical Review Research, Vol 4, Iss 4, p 043041 (2022)

We have investigated the rich dynamics of complex wave packets composed of multiple high-lying Rydberg states in He. A quantitative agreement is found between theory and time-resolved photoelectron spectroscopy experiments. We show that the intricate

Externí odkaz: https://doaj.org/article/1d3b9e6edf944499860f403a3bbc5502

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Element-Specific Magnetization Dynamics in Co–Pt Alloys Induced by Strong Optical Excitation

Autor: Johan Söderström, Robert Stefanuik, Hermann A. Dürr, Igor Vaskivskyi, Karel Carva, Rameez Saeed Malik, Diego Turenne, Eric E. Fullerton, Leandro Salemi, Peter M. Oppeneer, Jeffrey A. Brock, Ronny Knut, Olof Karis

Publikováno v: The Journal of Physical Chemistry C. 125:11714-11721

Ever since its first observation, the microscopic origin of ultrafast magnetization dynamics has been actively debated. Even more questions arise when considering composite materials featuring a combination of intrinsic and proximity-induced magnetic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a9cee7e9cb71ea8a2f8e82d127fff93
https://doi.org/10.1021/acs.jpcc.1c02311

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Element-selective ultrafast magnetization dynamics of hybrid Stoner-Heisenberg magnets

Autor: Mohamed F. Elhanoty, Olle Eriksson, Ronny Knut, Olof Karis, Oscar Grånäs

Publikováno v: Physical Review B. 105

Stoner and Heisenberg excitations in magnetic materials are inherently different. The first involves an effective reduction of the exchange splitting, whereas the second comprises excitation of spin waves. In this work, we test the impact of these tw

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8434a86c1d62e4e253329fd9c7cd9a21
https://doi.org/10.1103/physrevb.105.l100401

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Ultrafast manipulation of the NiO antiferromagnetic order via sub gap optical excitation

Publikováno v: Faraday Discussions
Faraday discussions 237, 300-316 (2022). doi:10.1039/d2fd00005a

Faraday discussions 237, 300 - 316 (2022). doi:10.1039/d2fd00005a
Wide-band-gap insulators such as NiO offer the exciting prospect of coherently manipulating electronic correlations with strong optical fields. Contrary to metals where rapid deph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd91710818ca9ccf146804ebbce90413
http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=107764

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Ultrafast magnetization dynamics in the half-metallic Heusler alloy Co2FeAl

Autor: Johan Söderström, Olle Eriksson, Yaroslav Kvashnin, Dibya Phuyal, I Vaskivskyi, Olof Karis, Sajid Husain, Danny Thonig, Rameez Saeed Malik, Rahul Gupta, Somnath Jana, Ankit Kumar, Ronny Knut, E. K. Delczeg-Czirjak, Robert Stefanuik, Peter Svedlindh

Publikováno v: Physical Review B. 104

We report on optically induced, ultrafast magnetization dynamics in the Heusler alloy ${\mathrm{Co}}_{2}\mathrm{FeAl}$, probed by time-resolved magneto-optical Kerr effect. Experimental results are compared to results from electronic structure theory

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::77b075ebd2e95ccc99618369f5c11ddb
https://doi.org/10.1103/physrevb.104.l100408

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Quantifying Spin Mixed States in Ferromagnets

Autor: Eugen Weschke, Ronny Knut, Olle Eriksson, Justin M. Shaw, Erna Krisztina Delczeg-Czirjak, Hans T. Nembach, Thomas J. Silva, Olof Karis, Sumanta Bhandary, Dario Arena, Abigail Armstrong, Yaroslav Kvashnin, Danny Thonig

Publikováno v: Physical Review Letters

We quantify the presence of spin-mixed states in ferromagnetic 3D transition metals by precise measurement of the orbital moment. While central to phenomena such as Elliot-Yafet scattering, quantification of the spin-mixing parameter has hitherto bee

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4384bb2e02a981eb5f3b5912f9f77c2b
http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=105122

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Analysis of the linear relationship between asymmetry and magnetic moment at the M edge of 3d transition metals

Autor: Alexander Yaresko, Rameez Saeed Malik, Johan Söderström, Raghuveer Chimata, Robert Stefanuik, Igor Di Marco, Olle Eriksson, Martina Ahlberg, Inka L. M. Locht, Marco Battiato, Yaroslav Kvashnin, Olof Karis, Johan Åkerman, Ronny Knut, Somnath Jana

Publikováno v: Physical Review Research. 2

The authors use ultrashort laser pulses to generate a highly non-equilibrium excited state in simple metallic ferromagnets, iron and nickel, in order to elucidate the differences between magnetic excitations and magnons. Utilizing extreme ultraviolet

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6add46bd2e11d591e056394aa62ac54f
https://doi.org/10.1103/physrevresearch.2.013180

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The valence band electronic structure of rhombohedral-like and tetragonal-like BiFeO 3 thin films from hard X-ray photoelectron spectroscopy and first-principles theory

Autor: Claude Ederer, Olof Karis, Dipanjan Mazumdar, Nicola A. Spaldin, Vilas Shelke, Oleg N. Mryasov, Ronny Knut, Mihaela Gorgoi, Florian Thöle, Arunava Gupta, Sergey V. Faleev

Publikováno v: Journal of Electron Spectroscopy and Related Phenomena. 208:63-66

We investigate the electronic structure of rhombohedral-like (R) and tetragonal-like (T) BiFeO3 thin films using high energy X-ray photoelectron spectroscopy and first-principles electronic structure calculations. By exploiting the relative elemental

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::52836ae84522567fcc2ba4386691a949
https://doi.org/10.1016/j.elspec.2015.10.002

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