Publications HAL de la collection CHIREX

Journal articles

titre
Control of the magnetic anisotropy in multirepeat Pt/Co/Al heterostructures using magnetoionic gating
auteur
Tristan da Câmara Santa Clara Gomes, Tanvi Bhatnagar-Schöffmann, Sachin Krishnia, Yanis Sassi, Dedalo Sanz-Hernández, Nicolas Reyren, Marie-Blandine Martin, Frederic Brunnett, Sophie Collin, Florian Godel, Shimpei Ono, Damien Querlioz, Dafiné Ravelosona, Vincent Cros, Julie Grollier, Pierre Seneor, Liza Herrera Diez
article
Physical Review Applied, 2024, 21 (2), pp.024010. ⟨10.1103/PhysRevApplied.21.024010⟩
typdoc
Journal articles
Accès au bibtex
https://arxiv.org/pdf/2310.01623 BibTex
titre
Fast current-induced skyrmion motion in synthetic antiferromagnets
auteur
van Tuong Pham, Naveen Sisodia, Ilaria Di Manici, Joseba Urrestarazu-Larrañaga, Kaushik Bairagi, Johan Pelloux-Prayer, Rodrigo Guedas, Liliana Buda-Prejbeanu, Stéphane Auffret, Andrea Locatelli, Tevfik Onur Menteş, Stefania Pizzini, Pawan Kumar, Aurore Finco, Vincent Jacques, Gilles Gaudin, Olivier Boulle
article
Science, 2024, 384 (6693), pp.307-312. ⟨10.1126/science.add5751⟩
resume
Magnetic skyrmions are topological magnetic textures that hold great promise as nanoscale bits of information in memory and logic devices. Although room-temperature ferromagnetic skyrmions and their current-induced manipulation have been demonstrated, their velocity has been limited to about 100 meters per second. In addition, their dynamics are perturbed by the skyrmion Hall effect, a motion transverse to the current direction caused by the skyrmion topological charge. Here, we show that skyrmions in compensated synthetic antiferromagnets can be moved by current along the current direction at velocities of up to 900 meters per second. This can be explained by the cancellation of the net topological charge leading to a vanishing skyrmion Hall effect. Our results open an important path toward the realization of logic and memory devices based on the fast manipulation of skyrmions in tracks.
typdoc
Journal articles
Accès au texte intégral et bibtex
https://hal.science/hal-04553207/file/add5751_ArticleContent_v15_FINAL_ACCEPTED.pdf BibTex
titre
Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru] 10 multilayers
auteur
Victor Ukleev, Fernando Ajejas, Anton Devishvili, Alexei Vorobiev, Nina-Juliane Steinke, Robert Cubitt, Chen Luo, Radu-Marius Abrudan, Florin Radu, Vincent Cros, Nicolas Reyren, Jonathan S White
article
Science and Technology of Advanced Materials, 2024, 25 (1), ⟨10.1080/14686996.2024.2315015⟩
typdoc
Journal articles
Accès au texte intégral et bibtex
https://hal.science/hal-04563374/file/Ukleev_Observation%20by%20SANS%20and%20PNR%20of%20pure%20N%20el-type%20domain%20wall%20profiles%20and%20skyrmion%20suppression%20below%20room%20temperature%20in%20magnetic%20Pt%20CoFeB%20Ru%2010%20multilayers_SciT.pdf BibTex
titre
Using hard-x-ray photoelectron spectroscopy to measure the oxidation state of gated Co/AlO$_x$ interfaces
auteur
Cristina Balan, Johanna Fischer, Capucine Gueneau, Aymen Fassatoui, Jean-Pascal Rueff, Denis Ceolin, Maurizio De-Santis, Jan Vogel, Laurent Ranno, Hélène Béa, Stefania Pizzini
article
Physical Review Applied, 2024, 21 (6), pp.064023. ⟨10.1103/PhysRevApplied.21.064023⟩
resume
The perpendicular magnetic anisotropy (PMA) of metal/ferromagnet (FM)/oxide trilayers is known to depend on the degree of oxidation of the FM/oxide interface. Among the different methods to tune the PMA, magnetoionics is emerging as a promising technique with potential applications in low-power spintronic devices. In this work, the PMA of Pt/Co/AlOx/HfO2 capacitorlike devices was gradually tuned by electric field gating. Hard-x-ray photoelectron spectroscopy (HAXPES) measurements at a synchrotron radiation source, guaranteeing tunable photon energies, a collimated beam, and a large photon flux, have allowed us to probe the composition of the cobalt ultrathin film buried below the dielectric layer of the capacitors, and its evolution upon the application of the gate voltage. The Co 2p HAXPES spectra of the gated devices were compared to those obtained for Pt/Co/AlOx reference samples, for which the PMA was controlled by tuning the Co oxidation with oxygen plasma. For similar magnetic anisotropy states, the two types of samples exhibit equivalent Co 2p HAXPES spectra, with the same weight of metallic Co and CoO signatures. These results constitute direct experimental proof that, in our integrated devices, the gate voltage modifies the PMA through the modification of the oxidation state of the buried cobalt layer driven by oxygen-ion migration.
typdoc
Journal articles
Accès au texte intégral et bibtex
https://hal.science/hal-04643875/file/Balan-PhysRevApplied.21.064023.pdf BibTex