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J. Carlos ROJAS-SANCHEZ

Juan Carlos Rojas-Sanchez is currently a CNRS permanent researcher at Institute Jean Lamour (IJL), Nancy, France. He received his Bachelor in Physics in 1999 from National University of Engineering (UNI), Lima, Peru, his Master in Physics in 2004 from Balseiro Institute, Bariloche, Argentina, and his Ph.D. in Physics in 2011 from Balseiro Institute (National University of Cuyo), Bariloche Atomic Center, Bariloche, Argentina.

From 2011-2015, he was a postdoctoral fellow in Laboratoire de Nanostructures et Magnetisme INAC/CEA, SPINTEC, Institut Néel, and Unité Mixte de Physique CNRS/Thales, France. He joined the CNRS in October 2015 as a researcher in the Spintronics and Nanomagnetism group at Institute Jean Lamour (IJL).
In 2018, he also became the Head of IJL’s micro and nanotechnologies competence center MiNaLor.

His main research interests span from spintronics to spin-caloritronics and spin-orbitronics. He studies spin current, spin Hall effect, Edelstein effect, and spin-orbit torque in 3D and 2D systems with the aim to obtain more efficient, faster, and environmentally cleaner devices for memory, energy harvesting, and logic applications. He has over 44 publications in international peer-reviewed journals such as Nature Materials, Advanced Materials, Nature Communications, Nano Letters, and Physical Review Letters, 10 as the first author and 9 as the second author, with a total citation of more than 2100. He has also served as the session chair of several significant international conferences and co-chair or chair of International Workshops in Spintronics.

 

Education

  • 2020             HDR French qualification, Lorraine University (France)
  • 2011             Ph.D. in Physics, Insituto Balseiro, U. Cuyo, Bariloche (Argentina)

Employment and Professional Experience

  • 2011-2013    Post-doc, CEA-Grenoble (France). CEA-Eurotalents Marie-Curie Actions Fellow.
  • 2013-2015    Post-doc, UMPhi CNRS/Thales (France).
  • 2015-           CNRS permanent researcher, Institute Jean Lamour (IJL), Nancy, France. "Chargé de récherche"

Institutional responsibilities

  • 2018– Present  Head of the Micro and nanotechnology platform of Lorraine, IJL’s CC-MiNaLor

                Cleanroom facilities including a staff of 3 engineers.

Project leader:

  • 2016             CNRS Cellule Energy (15 k€)
  • 2018-2021    Local Coordinator ANR MISSION (202 k€)
  • 2020-2023    PI ANR JCJC TOPTRONICS (256 k€)
  • 2021-2025    Local co-PI H2020 MSCA RISE ULTIMATE-I (444.5 k€)

Supervision: 2 post-doc, 2 PhD students, 2 M2 students, 2 M1 students, and Mentoring of 10 international internship students (resulted in publications with most of them) from Chine (3), USA (2), Peru (3), Mexico (1) and Argentina (1)

Research records(ISI Web of Science, Oct 2021) and scientific communication

  • 44 publications in international peer-reviewed journals including 1 Nat. Mater., 2 Adv. Materials, 2 Nat. Comm., 3 Nano Lett., 3 Phys. Rev. Lett, 4 Phys. Rev. Appl., 10 Phys. Rev. B and 7 Appl. Phys. Lett
  • 2138 citations (average 47.5 citations per article). 2998 citations in Google Scholar (GS).
  • 4 highly cited papers (top 1% for the field and publication year). The first author in three of them and the corresponding author in the fourth one. Nat Comm. 2013, PRL 2014, PRL 2016, and Nat. Materials 2016.
  • h-index: 20
  • 21 invited talk at international conferences
  • 11 contributed talks at international conferences
  • 15 seminars at Universities and research laboratories

Awards:

  • 2020: CNRS Bronze Medal. Link here
  • 2019: City Medal, Chepen (hometown in Peru)

Journal articles36 documents

  • David Céspedes-Berrocal, Heloïse Damas, Sébastien Petit-Watelot, David Maccariello, Ping Tang, et al.. Current-induced spin torques on single GdFeCo magnetic layers. Advanced Materials, Wiley-VCH Verlag, In press, ⟨10.1002/adma.202007047⟩. ⟨hal-03144856⟩
  • Alberto Anadón, Adrián Gudín, Rubén Guerrero, Iciar Arnay, Alejandra Guedeja-Marron, et al.. Engineering the spin conversion in graphene monolayer epitaxial structures. APL Materials, AIP Publishing 2021, 9, ⟨10.1063/5.0048612⟩. ⟨hal-03372205⟩
  • C. de Melo, C. Guillemard, A.M. Friedel, V. Palin, J.-C. Rojas-Sánchez, et al.. Unveiling transport properties of Co2MnSi Heusler epitaxial thin films with ultra-low magnetic damping. Applied Materials Today, Elsevier, 2021, 25, pp.101174. ⟨10.1016/j.apmt.2021.101174⟩. ⟨hal-03399352⟩
  • Kaushalya Jhuria, Julius Hohlfeld, Akshay Pattabi, Elodie Martin, Aldo Ygnacio Arriola Córdova, et al.. Spin–orbit torque switching of a ferromagnet with picosecond electrical pulses. Nature Electronics, Springer Nature, 2020, ⟨10.1038/s41928-020-00488-3⟩. ⟨hal-02988288⟩
  • T. Fache, J Rojas-Sánchez, L. Badie, S Mangin, S. Petit-Watelot. Determination of spin Hall angle, spin mixing conductance, and spin diffusion length in CoFeB/Ir for spin-orbitronic devices. Physical Review B, American Physical Society, 2020, 102, ⟨10.1103/physrevb.102.064425⟩. ⟨hal-02999938⟩
  • J.-C Rojas-Sánchez, A. Fert. Compared Efficiencies of Conversions between Charge and Spin Current by Spin-Orbit Interactions in Two-and Three-Dimensional Systems. Physical Review Applied, American Physical Society, In press, 11, ⟨10.1103/PhysRevApplied.11.054049⟩. ⟨hal-02405851⟩
  • C Guillemard, S. Petit-Watelot, L. Pasquier, D. Pierre, J. Ghanbaja, et al.. Ultra-low magnetic damping in Co 2 Mn-based Heusler compounds: promising materials for spintronic. Physical Review Applied, American Physical Society, 2019, pp.064009. ⟨10.1103/PhysRevApplied.11.064009⟩. ⟨hal-02134870⟩
  • Hao Wu, Yong Xu, Peng Deng, Quanjun Pan, Seyed Armin Razavi, et al.. Spin‐Orbit Torque Switching of a Nearly Compensated Ferrimagnet by Topological Surface States. Advanced Materials, Wiley-VCH Verlag, 2019, 2019, pp.1901681. ⟨10.1002/adma.201901681⟩. ⟨hal-02184543⟩
  • P. Laczkowski, M. Cosset-Cheneau, W. Savero-Torres, V. T. Pham, H. Jaffres, et al.. Spin-dependent transport characterization in metallic lateral spin valves using one-dimensional and three-dimensional modeling. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2019, 99 (134436), ⟨10.1103/PhysRevB.99.134436⟩. ⟨hal-02060993⟩
  • Er Liu, T. Fache, D Cespedes-Berrocal, Zhi Zhang, S. Petit-Watelot, et al.. Strain-Enhanced Charge-to-Spin Conversion in Ta/Fe/Pt Multilayers Grown on Flexible Mica Substrate. Physical Review Applied, American Physical Society, 2019, 12, ⟨10.1103/PhysRevApplied.12.044074⟩. ⟨hal-02405856⟩
  • Carolina Cerqueira, Jian Yin Qin, Huong Dang, Abdelhak Djeffal, Jean-Christophe Le Breton, et al.. Evidence of Pure Spin-Current Generated by Spin Pumping in Interface-Localized States in Hybrid Metal–Silicon–Metal Vertical Structures. Nano Letters, American Chemical Society, 2019, 19 (1), pp.90-99. ⟨10.1021/acs.nanolett.8b03386⟩. ⟨hal-01987996⟩
  • Soong-Geun Je, Juan-Carlos Rojas-Sanchez, Thai Ha Pham, Pierre Vallobra, Grégory Malinowski, et al.. Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling. Applied Physics Letters, American Institute of Physics, 2018, 112 (6), pp.62401 - 62401. ⟨10.1063/1.5017738⟩. ⟨hal-01764558⟩
  • T. Fache, H. Tarazona, J. Liu, G. L’vova, M Applegate, et al.. Nonmonotonic aftereffect measurements in perpendicular synthetic ferrimagnets. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 98 (6), pp.064410. ⟨10.1103/physrevb.98.064410⟩. ⟨hal-02011615⟩
  • Hilal Saglam, J. Carlos Rojas-Sanchez, Sébastien Petit, Michel Hehn, Wei Zhang, et al.. Independence of spin-orbit torques from the exchange bias direction in N i 81 F e 19 / IrMn bilayers. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 98 (9), pp.094407. ⟨10.1103/physrevb.98.094407⟩. ⟨hal-02086049v2⟩
  • C Guillemard, S. Petit-Watelot, S. Andrieu, J.-C. Rojas-Sánchez. Charge-spin current conversion in high quality epitaxial Fe/Pt systems: Isotropic spin Hall angle along different in-plane crystalline directions. Applied Physics Letters, American Institute of Physics, 2018, 113, ⟨10.1063/1.5079236⟩. ⟨hal-02999961⟩
  • Soong-Geun Je, Pierre Vallobra, Titiksha Srivastava, Juan-Carlos Rojas-Sanchez, Thai Ha Pham, et al.. Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films. Nano Letters, American Chemical Society, 2018, 18 (11), pp.7362. ⟨10.1021/acs.nanolett.8b03653⟩. ⟨hal-01903085⟩
  • Thai Ha Pham, Soong-Geun Je, Pierre Vallobra, Thibaud Fache, Daniel Lacour, et al.. Thermal Contribution to the Spin-Orbit Torque in Metallic-Ferrimagnetic Systems. Physical Review Applied, American Physical Society, 2018, 9, pp.064032. ⟨10.1103/PhysRevApplied.9.064032⟩. ⟨hal-01864006⟩
  • P. Vallobra, T. Fache, Y. Xu, L. Zhang, G. Malinowski, et al.. Manipulating exchange bias using all-optical helicity-dependent switching. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 96 (14), pp.329-336. ⟨10.1103/PhysRevB.96.144403⟩. ⟨hal-01624235⟩
  • Simón Oyarzún, Fabien Rortais, Juan-Carlos Rojas-Sanchez, Federico Bottegoni, Piotr Laczkowski, et al.. Spin–Charge Conversion Phenomena in Germanium. Journal of the Physical Society of Japan, Physical Society of Japan 日本物理学会, 2017, 86 (1), ⟨10.7566/JPSJ.86.011002⟩. ⟨hal-01614038⟩
  • Nirvana Caballero, Iván Fernández Aguirre, Lucas Albornoz, Alejandro Kolton, J.-C. Rojas-Sánchez, et al.. Excess velocity of magnetic domain walls close to the depinning field. Physical Review B, American Physical Society, 2017, 96, ⟨10.1103/PHYSREVB.96.224422⟩. ⟨hal-02999970⟩
  • P Laczkowski, Y Fu, H Yang, J.-C. Rojas-Sánchez, P Noel, et al.. Large enhancement of the spin Hall effect in Au by scattering with side-jump on Ta impurities. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 96 (14), pp.140405. ⟨10.1103/PhysRevB.96.140405⟩. ⟨hal-01579001⟩
  • S. Oyarzún, A. Nandy, F. Rortais, C. Rojas-Sánchez, M. Dau, et al.. Evidence for spin-to-charge conversion by Rashba coupling in metallic states at the Fe/Ge(111) interface. Nature Communications, Nature Publishing Group, 2016, 7, ⟨10.1038/ncomms13857⟩. ⟨hal-01614036⟩
  • C. Rinaldi, J. C. Rojas-Sánchez, R. Wang, Y. Fu, S. Oyarzún, et al.. Evidence for spin to charge conversion in GeTe(111). APL Materials, AIP Publishing 2016, 4 (3), ⟨10.1063/1.4941276⟩. ⟨hal-01614024⟩
  • J.C. Rojas-Sánchez, S. Oyarzún, Y. Fu, A. Marty, C. Vergnaud, et al.. Spin to Charge Conversion at Room Temperature by Spin Pumping into a New Type of Topological Insulator: α -Sn Films. Physical Review Letters, American Physical Society, 2016, 116 (9), ⟨10.1103/PhysRevLett.116.096602⟩. ⟨hal-01614026⟩
  • J.-C Rojas-Sánchez, P. Laczkowski, J. Sampaio, S. Collin, K. Bouzehouane, et al.. Perpendicular magnetization reversal in Pt/[Co/Ni]3/Al multilayers via the spin Hall effect of Pt. Applied Physics Letters, American Institute of Physics, 2016, 108. ⟨hal-02076530⟩
  • F Rortais, S. Oyarzún, F. Bottegoni, J Rojas-Sánchez, P Laczkowski, et al.. Spin transport in p -type germanium. Journal of Physics: Condensed Matter, IOP Publishing, 2016, 28 (16), ⟨10.1088/0953-8984/28/16/165801⟩. ⟨hal-01614027⟩
  • Thai Ha Pham, J. Vogel, J. Sampaio, M. Vaňatka, J.-C. Rojas-Sanchez, et al.. Very large domain wall velocities in Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2016, 113 (6), pp.67001. ⟨10.1209/0295-5075/113/67001⟩. ⟨hal-01275326⟩
  • E. Lesne, Yu Fu, S. Oyarzún, J. C. Rojas-Sánchez, D. C. Vaz, et al.. Highly efficient and tunable spin-to-charge conversion through Rashba coupling at oxide interfaces. Nature Materials, Nature Publishing Group, 2016, 15 (12), pp.1261 - 1266. ⟨10.1038/nmat4726⟩. ⟨hal-01614031⟩
  • Piotr Laczkowski, Henri Jaffrès, Williams Savero Torres, J. C. Rojas-Sánchez, Yu Fu, et al.. Evaluation of spin diffusion length of AuW alloys using spin absorption experiments in the limit of large spin-orbit interactions. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 92 (21), pp.214405. ⟨10.1103/PhysRevB.92.214405⟩. ⟨hal-01615212⟩
  • Marek Vanatka, Juan-Carlos Rojas-Sanchez, Jan Vogel, Marlio Bonfim, André Thiaville, et al.. Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes. Journal of Physics: Condensed Matter, IOP Publishing, 2015, 27 (32), pp.326002. ⟨10.1088/0953-8984/27/32/326002⟩. ⟨hal-01140893⟩
  • J.-C. Rojas-Sánchez, N. Reyren, P. Laczkowski, W. Savero, J.P. Attané, et al.. Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces. Physical Review Letters, American Physical Society, 2014, 112 (10), ⟨10.1103/PhysRevLett.112.106602⟩. ⟨hal-02042890⟩
  • W. Savero Torres, P. Laczkowski, V. Nguyen, J. Rojas Sanchez, Laurent Vila. Switchable Spin-Current Source Controlled by Magnetic Domain Walls. Nano Letters, American Chemical Society, 2014, 14 (7), pp.4016-4022. ⟨10.1021/nl501453p⟩. ⟨hal-02042863⟩
  • P. Laczkowski, J.-C. Rojas-Sánchez, W. Savero-Torres, H. Jaffrès, N. Reyren, et al.. Experimental evidences of a large extrinsic spin Hall effect in AuW alloy. Applied Physics Letters, American Institute of Physics, 2014, 104 (14), pp.142403. ⟨10.1063/1.4870835⟩. ⟨hal-02042880⟩
  • J.C. Rojas Sanchez, Laurent Vila, G. Desfonds, S. Gambarelli, J. Attané, et al.. Spin-to-charge conversion using Rashba coupling at the interface between non-magnetic materials. Nature Communications, Nature Publishing Group, 2013, 4 (1), ⟨10.1038/ncomms3944⟩. ⟨hal-02042921⟩
  • Abhinav Jain, Juan-Carlos Rojas-Sanchez, Murat Cubukcu, Julian Peiro, Jean-Christophe Le Breton, et al.. Transition from spin accumulation into interface states to spin injection in silicon and germanium conduction bands. The European Physical Journal B: Condensed Matter and Complex Systems, Springer-Verlag, 2013, 86, pp.140. ⟨10.1140/EPJB/E2013-31067-7⟩. ⟨hal-00921473⟩
  • A. Jain, C. Rojas-Sánchez, M. Cubukcu, J. Peiro, J. C. Le Breton, et al.. Crossover from Spin Accumulation into Interface States to Spin Injection in the Germanium Conduction Band. Physical Review Letters, American Physical Society, 2012, 109, pp.106603. ⟨10.1103/PhysRevLett.109.106603⟩. ⟨hal-01683673⟩

Habilitation à diriger des recherches1 document

  • J.-C. Rojas-Sánchez. HDR qualification. Different spin current sources: from interfaces to bulk materials. Condensed Matter [cond-mat]. Université de Lorraine, 2020. ⟨tel-03092237⟩

Conference papers2 documents

  • Piotr Laczkowski, Juan Rojas-Sánchez, Yu Fu, Williams Savero-Torres, Nicolas Reyren, et al.. Spin Hall effect in AuW alloys. SPIE 9931, Spintronics IX, Aug 2016, San Diego, United States. pp. 993108, ⟨10.1117/12.2238694⟩. ⟨cea-01511834⟩
  • J.-C. Rojas-Sánchez, N. Reyren, P. Laczkowski, W. Savero, J.-P Attané, et al.. Spin pumping and inverse spin Hall effect in platinum and other 5 d metals: the essential role of spin-memory loss and spin-current discontinuities at interfaces. SPIE NanoScience + Engineering, Aug 2014, San Diego, France. pp.916729, ⟨10.1117/12.2059646⟩. ⟨hal-02076508⟩