{"id":133,"date":"2019-05-27T09:08:33","date_gmt":"2019-05-27T07:08:33","guid":{"rendered":"https:\/\/magnefi.c2n.u-psud.fr\/?page_id=133"},"modified":"2020-06-23T11:48:31","modified_gmt":"2020-06-23T09:48:31","slug":"cnrs-combined-gating-and-optical-control-of-skyrmion-bubbles","status":"publish","type":"page","link":"https:\/\/magnefi.c2n.u-psud.fr\/?page_id=133","title":{"rendered":"CNRS: Combined gating and optical control of skyrmion-bubbles"},"content":{"rendered":"\n
\"\"<\/figure><\/div>\n\n\n\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/strong><\/p>\n\n\n\n

Host:<\/strong> Institut\nN\u00e9el, CNRS<\/p>\n\n\n\n

Location:<\/strong> Grenoble, France<\/p>\n\n\n\n

Supervisors:<\/strong> Stefania Pizzini, Laurent Ranno, Jan Vogel<\/a><\/p>\n\n\n\n

Scientific\nproject<\/strong>:<\/strong><\/p>\n\n\n\n

Chiral N\u00e9el walls and magnetic skyrmions are swirling\nspin textures with nanoscale dimensions and a non-trivial topology. In thin\nmagnetic films, they are stabilized by interfacial Dzyaloshinskii-Moriya  interaction. On the other hand,  the recent observation [1] of skyrmions at room temperature in conventional transition-metal-based\nmagnetic multilayers (collaboration SPINTEC\/Institut N\u00e9el)   is\npromising for spintronics applications including magnetic memories and logic\ngates. The Micro and Nanomagnetism group at Institut N\u00e9el (CNRS-Grenoble) had\npioneered the control of magnetic properties with electric field gating [2]. Recently, we have demonstrated the electric field control of domain wall\nmotion [3] and the possibility to control the skyrmion nucleation, annihilation and\nstability with electric field gating [4]. We have also developed an\nanalytical model that allows us to predict skyrmion stability as a function of\nthe thin films morphology and magnetic properties [5]. <\/p>\n\n\n\n

The objective of this project is threefold. First, based on our model, we will engineer materials in which skyrmions will be stable at room temperature and mobile under the application of spin polarized current pulses. Second, an elementary device will be conceived: skyrmions will be injected in a narrow strip,  along which they will be displaced by current; local sub-micrometric local gates will serve to nucleate, annihilate and control their position. The third aspect will be carried out in collaboration with the Technical University of Eindhoven where we will combine the aforementioned achievements with the possibility to nucleate domain walls and skyrmions with ultrafast light pulses. <\/p>\n\n\n\n

The chosen candidate tasks will be:  (i) to select and optimize the magnetic\nproperties of  thin films (typically\nPt\/Co\/oxide stack) with perpendicular anisotropy where skyrmion-bubbles\nspontaneously appear. (ii) in cleanroom environment, to process the films in\nnanostructures for current\/field displacement of chiral domain walls and\nskyrmion bubbles (iii) to use local gates to characterise the gating dependence\nof the dynamics of domain walls and skyrmion bubbles. <\/p>\n\n\n\n

The skyrmion\/domain wall dynamics will be observed by\nMagneto-Optical Kerr microscopy, Magnetic Force Microscopy (MFM) and\nsynchrotron radiation techniques. <\/p>\n\n\n\n

The analytical\nmodel will be applied to well characterized materials to predict the dynamical\nproperties of the skyrmions (nucleation, collapse, mobility). Moreover, the\nmodel will be used in  a predictive way to\npropose the most efficient way to nucleate, propagate, pin and release\nskyrmions using electric gates and hot spots. <\/p>\n\n\n\n

1.\nBoulle, O. et al. <\/em>Room-temperature chiral magnetic skyrmions in\nultrathin magnetic nanostructures. Nat Nano <\/em>11, <\/strong>449 (2016).<\/strong><\/p>\n\n\n\n

2.<\/strong> <\/strong>Weisheit, M. et al. <\/em>Electric\nField-Induced Modification of Magnetism in Thin-Film Ferromagnets. Science\n(80-. ). <\/em>315, <\/strong>349\u2013351 (2007). <\/p>\n\n\n\n

3. Bernand-Mantel, A. et al. <\/em>Electric-field\ncontrol of domain wall nucleation and pinning in a metallic ferromagnet. Appl.\nPhys. Lett. <\/em>102, <\/strong>122406 (2013).<\/p>\n\n\n\n

4. Schott, M. et al. <\/em>The skyrmion switch:\nturning magnetic skyrmion bubbles on and off with an electrci field. Nano\nLett. <\/em>17<\/strong>, 3006 (2017)<\/p>\n\n\n\n

5. A. Bernand-Mantel et al.<\/em> <\/strong>The skyrmion-bubble transition in a ferromagnetic thin film; SciPost Phys.<\/em> 4, 027 (2018).<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Host: Institut N\u00e9el, CNRS Location: Grenoble, France Supervisors: Stefania Pizzini, Laurent Ranno, Jan Vogel Scientific project: Chiral N\u00e9el walls and magnetic skyrmions are swirling spin textures with nanoscale dimensions and a non-trivial topology. In thin magnetic films, they are stabilized by interfacial Dzyaloshinskii-Moriya  interaction. On the other hand,  the recent observation [1] of skyrmions… Continue reading “CNRS: Combined gating and optical control of skyrmion-bubbles”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":52,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"templates\/fullwidth.php","meta":[],"_links":{"self":[{"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/pages\/133"}],"collection":[{"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=133"}],"version-history":[{"count":7,"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/pages\/133\/revisions"}],"predecessor-version":[{"id":468,"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/pages\/133\/revisions\/468"}],"up":[{"embeddable":true,"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=\/wp\/v2\/pages\/52"}],"wp:attachment":[{"href":"https:\/\/magnefi.c2n.u-psud.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}