Magnetic Amplification at Yb3+ “Designer Defects” in the van der Waals Ferromagnet CrI3
The two-dimensional (2D) van der Waals ferromagnet CrI3 has been doped with the magnetic optical impurity Yb3+ to yield materials that display sharp multiline Yb3+ photoluminescence (PL) controlled by the magnetism of CrI3. Magneto-PL shows that Yb3+ magnetization is pinned to the magnetization of C...
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| Veröffentlicht in: | Nano letters 2023-02, Vol.23 (4), p.1320-1326 |
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| creator | Pressler, Kimo Snoeren, Thom J. Walsh, Kelly M. Gamelin, Daniel R. |
| description | The two-dimensional (2D) van der Waals ferromagnet CrI3 has been doped with the magnetic optical impurity Yb3+ to yield materials that display sharp multiline Yb3+ photoluminescence (PL) controlled by the magnetism of CrI3. Magneto-PL shows that Yb3+ magnetization is pinned to the magnetization of CrI3. An effective internal field of ∼10 T at Yb3+ is estimated, attributed to strong in-plane Yb3+–Cr3+ superexchange coupling. The anomalously low energy of Yb3+ PL in CrI3 reflects relatively high Yb3+–I– covalency, contributing to Yb3+–Cr3+ superexchange coupling. The Yb3+ PL energy and line width both reveal the effects of spontaneous zero-field CrI3 magnetic ordering within 2D layers below T C, despite the absence of net magnetization in multilayer samples. These results illustrate the use of optical impurities as “designer defects” to introduce unique functionality to 2D magnets. |
| doi_str_mv | 10.1021/acs.nanolett.2c04533 |
| format | Article |
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Magneto-PL shows that Yb3+ magnetization is pinned to the magnetization of CrI3. An effective internal field of ∼10 T at Yb3+ is estimated, attributed to strong in-plane Yb3+–Cr3+ superexchange coupling. The anomalously low energy of Yb3+ PL in CrI3 reflects relatively high Yb3+–I– covalency, contributing to Yb3+–Cr3+ superexchange coupling. The Yb3+ PL energy and line width both reveal the effects of spontaneous zero-field CrI3 magnetic ordering within 2D layers below T C, despite the absence of net magnetization in multilayer samples. These results illustrate the use of optical impurities as “designer defects” to introduce unique functionality to 2D magnets.</description><identifier>ISSN: 1530-6984</identifier><identifier>EISSN: 1530-6992</identifier><identifier>DOI: 10.1021/acs.nanolett.2c04533</identifier><language>eng</language><publisher>American Chemical Society</publisher><ispartof>Nano letters, 2023-02, Vol.23 (4), p.1320-1326</ispartof><rights>2023 American Chemical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0001-5349-8816 ; 0000-0001-8055-3710 ; 0000-0003-2788-1592 ; 0000-0003-2888-9916</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.2c04533$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acs.nanolett.2c04533$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,27076,27924,27925,56738,56788</link.rule.ids></links><search><creatorcontrib>Pressler, Kimo</creatorcontrib><creatorcontrib>Snoeren, Thom J.</creatorcontrib><creatorcontrib>Walsh, Kelly M.</creatorcontrib><creatorcontrib>Gamelin, Daniel R.</creatorcontrib><title>Magnetic Amplification at Yb3+ “Designer Defects” in the van der Waals Ferromagnet CrI3</title><title>Nano letters</title><addtitle>Nano Lett</addtitle><description>The two-dimensional (2D) van der Waals ferromagnet CrI3 has been doped with the magnetic optical impurity Yb3+ to yield materials that display sharp multiline Yb3+ photoluminescence (PL) controlled by the magnetism of CrI3. Magneto-PL shows that Yb3+ magnetization is pinned to the magnetization of CrI3. An effective internal field of ∼10 T at Yb3+ is estimated, attributed to strong in-plane Yb3+–Cr3+ superexchange coupling. The anomalously low energy of Yb3+ PL in CrI3 reflects relatively high Yb3+–I– covalency, contributing to Yb3+–Cr3+ superexchange coupling. The Yb3+ PL energy and line width both reveal the effects of spontaneous zero-field CrI3 magnetic ordering within 2D layers below T C, despite the absence of net magnetization in multilayer samples. 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Magneto-PL shows that Yb3+ magnetization is pinned to the magnetization of CrI3. An effective internal field of ∼10 T at Yb3+ is estimated, attributed to strong in-plane Yb3+–Cr3+ superexchange coupling. The anomalously low energy of Yb3+ PL in CrI3 reflects relatively high Yb3+–I– covalency, contributing to Yb3+–Cr3+ superexchange coupling. The Yb3+ PL energy and line width both reveal the effects of spontaneous zero-field CrI3 magnetic ordering within 2D layers below T C, despite the absence of net magnetization in multilayer samples. 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| title | Magnetic Amplification at Yb3+ “Designer Defects” in the van der Waals Ferromagnet CrI3 |
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