Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy
Abstract Their high tunability of electronic and magnetic properties makes transition‐metal oxides (TMOs) highly intriguing for fundamental studies and promising for a wide range of applications. TMOs with strong ferrimagnetism provide new platforms for tailoring the anomalous Hall effect (AHE) beyo...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-10-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202302956 |
| _version_ | 1797663913360228352 |
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| author | Hua Lv Xiao Chun Huang Kelvin Hong Liang Zhang Oliver Bierwagen Manfred Ramsteiner |
| author_facet | Hua Lv Xiao Chun Huang Kelvin Hong Liang Zhang Oliver Bierwagen Manfred Ramsteiner |
| author_sort | Hua Lv |
| collection | DOAJ |
| description | Abstract Their high tunability of electronic and magnetic properties makes transition‐metal oxides (TMOs) highly intriguing for fundamental studies and promising for a wide range of applications. TMOs with strong ferrimagnetism provide new platforms for tailoring the anomalous Hall effect (AHE) beyond conventional concepts based on ferromagnets, and particularly TMOs with perpendicular magnetic anisotropy (PMA) are of prime importance for today's spintronics. This study reports on transport phenomena and magnetic characteristics of the ferrimagnetic TMO NiCo2O4 (NCO) exhibiting PMA. The entire electrical and magnetic properties of NCO films are strongly correlated with their conductivities governed by the cation valence states. The AHE exhibits an unusual sign reversal resulting from a competition between intrinsic and extrinsic mechanisms depending on the conductivity, which can be tuned by the synthesis conditions independent of the film thickness. Importantly, skew‐scattering is identified as an AHE contribution for the first time in the low‐conductivity regime. Application wise, the robust PMA without thickness limitation constitutes a major advantage compared to conventional PMA materials utilized in today's spintronics. The great potential for applications is exemplified by two proposed novel device designs consisting only of NCO films that open a new route for future spintronics, such as ferrimagnetic high‐density memories. |
| first_indexed | 2024-03-11T19:22:38Z |
| format | Article |
| id | doaj.art-ff3bc290a03d4b49a2527db56b3eddbc |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-03-11T19:22:38Z |
| publishDate | 2023-10-01 |
| publisher | Wiley |
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| series | Advanced Science |
| spelling | doaj.art-ff3bc290a03d4b49a2527db56b3eddbc2023-10-07T03:51:49ZengWileyAdvanced Science2198-38442023-10-011028n/an/a10.1002/advs.202302956Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic AnisotropyHua Lv0Xiao Chun Huang1Kelvin Hong Liang Zhang2Oliver Bierwagen3Manfred Ramsteiner4Paul‐Drude‐Institut für Festkörperelektronik Leibniz‐Institut im Forschungsverbund Berlin e. V. Hausvogteiplatz 5–7 10117 Berlin GermanyState Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. ChinaState Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. ChinaPaul‐Drude‐Institut für Festkörperelektronik Leibniz‐Institut im Forschungsverbund Berlin e. V. Hausvogteiplatz 5–7 10117 Berlin GermanyPaul‐Drude‐Institut für Festkörperelektronik Leibniz‐Institut im Forschungsverbund Berlin e. V. Hausvogteiplatz 5–7 10117 Berlin GermanyAbstract Their high tunability of electronic and magnetic properties makes transition‐metal oxides (TMOs) highly intriguing for fundamental studies and promising for a wide range of applications. TMOs with strong ferrimagnetism provide new platforms for tailoring the anomalous Hall effect (AHE) beyond conventional concepts based on ferromagnets, and particularly TMOs with perpendicular magnetic anisotropy (PMA) are of prime importance for today's spintronics. This study reports on transport phenomena and magnetic characteristics of the ferrimagnetic TMO NiCo2O4 (NCO) exhibiting PMA. The entire electrical and magnetic properties of NCO films are strongly correlated with their conductivities governed by the cation valence states. The AHE exhibits an unusual sign reversal resulting from a competition between intrinsic and extrinsic mechanisms depending on the conductivity, which can be tuned by the synthesis conditions independent of the film thickness. Importantly, skew‐scattering is identified as an AHE contribution for the first time in the low‐conductivity regime. Application wise, the robust PMA without thickness limitation constitutes a major advantage compared to conventional PMA materials utilized in today's spintronics. The great potential for applications is exemplified by two proposed novel device designs consisting only of NCO films that open a new route for future spintronics, such as ferrimagnetic high‐density memories.https://doi.org/10.1002/advs.202302956anomalous Hall effectferrimagnetic spintronicsinverse spinel structuremagnetoresistanceperpendicular magnetic anisotropyskew‐scattering |
| spellingShingle | Hua Lv Xiao Chun Huang Kelvin Hong Liang Zhang Oliver Bierwagen Manfred Ramsteiner Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy Advanced Science anomalous Hall effect ferrimagnetic spintronics inverse spinel structure magnetoresistance perpendicular magnetic anisotropy skew‐scattering |
| title | Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy |
| title_full | Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy |
| title_fullStr | Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy |
| title_full_unstemmed | Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy |
| title_short | Underlying Mechanisms and Tunability of the Anomalous Hall Effect in NiCo2O4 Films with Robust Perpendicular Magnetic Anisotropy |
| title_sort | underlying mechanisms and tunability of the anomalous hall effect in nico2o4 films with robust perpendicular magnetic anisotropy |
| topic | anomalous Hall effect ferrimagnetic spintronics inverse spinel structure magnetoresistance perpendicular magnetic anisotropy skew‐scattering |
| url | https://doi.org/10.1002/advs.202302956 |
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