Laser patterning of the room temperature van der Waals ferromagnet 1$T$-CrTe$_2$
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2025
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| author | Riccardi, Tristan Sarkar, Suman Purbawati, Anike Arrighi, Aloïs Kostka, Marek Hadj-Azzem, Abdellali Vogel, Jan Renard, Julien Marty, Laëtitia Pawbake, Amit Faugeras, Clément Watanabe, Kenji Taniguchi, Takashi Finco, Aurore Jacques, Vincent Ren, Lei Marie, Xavier Robert, Cedric Nuñez-Regueiro, Manuel Rougemaille, Nicolas Bendiab, Nedjma Coraux, Johann |
| author_facet | Riccardi, Tristan Sarkar, Suman Purbawati, Anike Arrighi, Aloïs Kostka, Marek Hadj-Azzem, Abdellali Vogel, Jan Renard, Julien Marty, Laëtitia Pawbake, Amit Faugeras, Clément Watanabe, Kenji Taniguchi, Takashi Finco, Aurore Jacques, Vincent Ren, Lei Marie, Xavier Robert, Cedric Nuñez-Regueiro, Manuel Rougemaille, Nicolas Bendiab, Nedjma Coraux, Johann |
| contents | Lamellar crystalline materials, whose layers are bond by van der Waals forces, can be stacked to form ultrathin artificial heterostructures, and in particular vertical magnetic junctions when some of the stacked materials are (ferro)magnetic. Here, using the room temperature van der Waals ferromagnet 1$T$-CrTe$_2$, we report a method for patterning lateral magnetic junctions. Exploiting the heat-induced phase transformation of the material into Cr$_x$Te$_y$ compounds ($x/y>1/2$), we use local laser heating to imprint patterns at the micron-scale. Optimizing laser heat dissipation, we further demonstrate the crucial role of the substrate to control the phase transformation. If plain, unstructured poorly heat-conducting substrates allow for direct writing of magnetic patterns, structured $h$-BN layers can serve as heat stencils to draw potentially thinner patterns. Besides, $h$-BN encapsulation turns out to be heat-protective (in addition from protecting against oxidation as it is generally used for), allowing the demonstration of room temperature ferromagnetism in $<$7~nm-thick 1$T$-CrTe$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_16736 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Laser patterning of the room temperature van der Waals ferromagnet 1$T$-CrTe$_2$ Riccardi, Tristan Sarkar, Suman Purbawati, Anike Arrighi, Aloïs Kostka, Marek Hadj-Azzem, Abdellali Vogel, Jan Renard, Julien Marty, Laëtitia Pawbake, Amit Faugeras, Clément Watanabe, Kenji Taniguchi, Takashi Finco, Aurore Jacques, Vincent Ren, Lei Marie, Xavier Robert, Cedric Nuñez-Regueiro, Manuel Rougemaille, Nicolas Bendiab, Nedjma Coraux, Johann Materials Science Lamellar crystalline materials, whose layers are bond by van der Waals forces, can be stacked to form ultrathin artificial heterostructures, and in particular vertical magnetic junctions when some of the stacked materials are (ferro)magnetic. Here, using the room temperature van der Waals ferromagnet 1$T$-CrTe$_2$, we report a method for patterning lateral magnetic junctions. Exploiting the heat-induced phase transformation of the material into Cr$_x$Te$_y$ compounds ($x/y>1/2$), we use local laser heating to imprint patterns at the micron-scale. Optimizing laser heat dissipation, we further demonstrate the crucial role of the substrate to control the phase transformation. If plain, unstructured poorly heat-conducting substrates allow for direct writing of magnetic patterns, structured $h$-BN layers can serve as heat stencils to draw potentially thinner patterns. Besides, $h$-BN encapsulation turns out to be heat-protective (in addition from protecting against oxidation as it is generally used for), allowing the demonstration of room temperature ferromagnetism in $<$7~nm-thick 1$T$-CrTe$_2$. |
| title | Laser patterning of the room temperature van der Waals ferromagnet 1$T$-CrTe$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2501.16736 |