3 results on '"T. Guillet"'
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2. Electrical Detection of Magnetic Circular Dichroism: Application to Magnetic Microscopy in Ultrathin Ferromagnetic Films
- Author
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Matthieu Jamet, T. Guillet, Frédéric Bonell, C. Vergnaud, Alain Marty, SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)
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[PHYS]Physics [physics] ,Superconductivity ,Condensed Matter - Materials Science ,Materials science ,Kerr effect ,Magnetic moment ,Condensed matter physics ,Magnetic circular dichroism ,Magnetometer ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,3. Good health ,law.invention ,Condensed Matter::Materials Science ,Ferromagnetism ,law ,0103 physical sciences ,Microscopy ,Magnetic force microscope ,010306 general physics ,0210 nano-technology - Abstract
Imaging the magnetic configuration of thin-films has been a long-standing area of research. Since a few years, the emergence of two-dimensional ferromagnetic materials calls for innovation in the field of magnetic imaging. As the magnetic moments are extremely small, standard techniques like SQUID, torque magnetometry, magnetic force microscopy and Kerr effect microscopy are challenging and often lead to the detection of parasitic magnetic contributions or spurious effects. In this work, we report a new magnetic microscopy technique based on the combination of magnetic circular dichroism and Seebeck effect in semiconductor/ferromagnet bilayers. We implement this method with perpendicularly magnetized (Co/Pt) multilayers sputtered on Ge (111). We further show that the electrical detection of MCD is more sensitive than the Kerr magnetometry, especially in the ultra-thin film regime, which makes it particularly promising for the study of emergent two-dimensional ferromagnetic materials., 8 pages, 10 figures
- Published
- 2021
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3. Spin orbitronics at a topological insulator-semiconductor interface
- Author
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Aurélien Masseboeuf, Franco Ciccacci, Alain Marty, Federico Bottegoni, Paolo Biagioni, Mairbek Chshiev, Hanako Okuno, Ali Hallal, C. Vergnaud, Carlo Zucchetti, T. Guillet, Marco Finazzi, Adele Marchionni, Matthieu Jamet, SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Politecn Milan, LNESS Dipartimento Fis, I-22100 Como, Italy, Laboratoire d'Etude des Matériaux par Microscopie Avancée (LEMMA ), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), ANR-16-CE24-0017,TOP-RISE,Isolant topologique et etats d'interfaces Rashba pour l'électronique de spin(2016), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
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Population ,FOS: Physical sciences ,chemistry.chemical_element ,Germanium ,02 engineering and technology ,Substrate (electronics) ,01 natural sciences ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,Texture (crystalline) ,010306 general physics ,education ,Spin-½ ,Surface states ,[PHYS]Physics [physics] ,Physics ,Condensed Matter - Materials Science ,education.field_of_study ,Condensed Matter - Mesoscale and Nanoscale Physics ,[PHYS.PHYS]Physics [physics]/Physics [physics] ,Condensed matter physics ,business.industry ,Materials Science (cond-mat.mtrl-sci) ,021001 nanoscience & nanotechnology ,Semiconductor ,chemistry ,Topological insulator ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,0210 nano-technology ,business - Abstract
Topological insulators (TIs) hold great promises for new spin-related phenomena and applications thanks to the spin texture of their surface states. However, a versatile platform allowing for the exploitation of these assets is still lacking due to the difficult integration of these materials with the mainstream Si-based technology. Here, we exploit germanium as a substrate for the growth of Bi$_2$Se$_3$, a prototypical TI. We probe the spin properties of the Bi$_2$Se$_3$/Ge pristine interface by investigating the spin-to-charge conversion taking place in the interface states by means of a non-local detection method. The spin population is generated by optical orientation in Ge, and diffuses towards the Bi$_2$Se$_3$ which acts as a spin detector. We compare the spin-to-charge conversion in Bi$_2$Se$_3$/Ge with the one taking place in Pt in the same experimental conditions. Notably, the sign of the spin-to-charge conversion given by the TI detector is reversed compared to the Pt one, while the efficiency is comparable. By exploiting first-principles calculations, we ascribe the sign reversal to the hybridization of the topological surface states of Bi$_2$Se$_3$ with the Ge bands. These results pave the way for the implementation of highly efficient spin detection in TI-based architectures compatible with semiconductor-based platforms., Comment: 5 pages and 5 figures
- Published
- 2020
- Full Text
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