Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices
Multiferroics, materials in which both magnetic and electric fields can induce each other, resulting in a magnetoelectric response, have been attracting increasing attention, although the induced magnetic susceptibility and dielectric constant are usually small and have typically been reported for l...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2015-02-01
|
| Series: | Science and Technology of Advanced Materials |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1088/1468-6996/16/1/014402 |
| _version_ | 1819127539638992896 |
|---|---|
| author | Junji Tominaga Alexander V Kolobov Paul J Fons Xiaomin Wang Yuta Saito Takashi Nakano Muneaki Hase Shuichi Murakami Jens Herfort Yukihiko Takagaki |
| author_facet | Junji Tominaga Alexander V Kolobov Paul J Fons Xiaomin Wang Yuta Saito Takashi Nakano Muneaki Hase Shuichi Murakami Jens Herfort Yukihiko Takagaki |
| author_sort | Junji Tominaga |
| collection | DOAJ |
| description | Multiferroics, materials in which both magnetic and electric fields can induce each other, resulting in a magnetoelectric response, have been attracting increasing attention, although the induced magnetic susceptibility and dielectric constant are usually small and have typically been reported for low temperatures. The magnetoelectric response usually depends on d-electrons of transition metals. Here we report that in [(GeTe)2(Sb2Te3)l]m superlattice films (where l and m are integers) with topological phase transition, strong magnetoelectric response may be induced at temperatures above room temperature when the external fields are applied normal to the film surface. By ab initio computer simulations, it is revealed that the multiferroic properties are induced due to the breaking of spatial inversion symmetry when the p-electrons of Ge atoms change their bonding geometry from octahedral to tetrahedral. Finally, we demonstrate the existence in such structures of spin memory, which paves the way for a future hybrid device combining nonvolatile phase-change memory and magnetic spin memory. |
| first_indexed | 2024-12-22T08:13:32Z |
| format | Article |
| id | doaj.art-34536dafa8c64973b744457b439da4e5 |
| institution | Directory Open Access Journal |
| issn | 1468-6996 1878-5514 |
| language | English |
| last_indexed | 2024-12-22T08:13:32Z |
| publishDate | 2015-02-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Science and Technology of Advanced Materials |
| spelling | doaj.art-34536dafa8c64973b744457b439da4e52022-12-21T18:32:57ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142015-02-0116110.1088/1468-6996/16/1/01440211661235Giant multiferroic effects in topological GeTe-Sb2Te3 superlatticesJunji Tominaga0Alexander V Kolobov1Paul J Fons2Xiaomin Wang3Yuta Saito4Takashi Nakano5Muneaki Hase6Shuichi Murakami7Jens Herfort8Yukihiko Takagaki9National Institute of Advanced Industrial Science & Technology (AIST)National Institute of Advanced Industrial Science & Technology (AIST)National Institute of Advanced Industrial Science & Technology (AIST)National Institute of Advanced Industrial Science & Technology (AIST)National Institute of Advanced Industrial Science & Technology (AIST)National Institute of Advanced Industrial Science & Technology (AIST)University of TsukubaTokyo Institute of TechnologyPaul-Drude-Institut für FestkörperelektronikPaul-Drude-Institut für FestkörperelektronikMultiferroics, materials in which both magnetic and electric fields can induce each other, resulting in a magnetoelectric response, have been attracting increasing attention, although the induced magnetic susceptibility and dielectric constant are usually small and have typically been reported for low temperatures. The magnetoelectric response usually depends on d-electrons of transition metals. Here we report that in [(GeTe)2(Sb2Te3)l]m superlattice films (where l and m are integers) with topological phase transition, strong magnetoelectric response may be induced at temperatures above room temperature when the external fields are applied normal to the film surface. By ab initio computer simulations, it is revealed that the multiferroic properties are induced due to the breaking of spatial inversion symmetry when the p-electrons of Ge atoms change their bonding geometry from octahedral to tetrahedral. Finally, we demonstrate the existence in such structures of spin memory, which paves the way for a future hybrid device combining nonvolatile phase-change memory and magnetic spin memory.http://dx.doi.org/10.1088/1468-6996/16/1/014402multiferroicsmagnetoresistancetopological insulatorchalcogenide superlatticegete-sb2te3phase change memoryspintronicscomputer simulation |
| spellingShingle | Junji Tominaga Alexander V Kolobov Paul J Fons Xiaomin Wang Yuta Saito Takashi Nakano Muneaki Hase Shuichi Murakami Jens Herfort Yukihiko Takagaki Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices Science and Technology of Advanced Materials multiferroics magnetoresistance topological insulator chalcogenide superlattice gete-sb2te3 phase change memory spintronics computer simulation |
| title | Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices |
| title_full | Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices |
| title_fullStr | Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices |
| title_full_unstemmed | Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices |
| title_short | Giant multiferroic effects in topological GeTe-Sb2Te3 superlattices |
| title_sort | giant multiferroic effects in topological gete sb2te3 superlattices |
| topic | multiferroics magnetoresistance topological insulator chalcogenide superlattice gete-sb2te3 phase change memory spintronics computer simulation |
| url | http://dx.doi.org/10.1088/1468-6996/16/1/014402 |
| work_keys_str_mv | AT junjitominaga giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT alexandervkolobov giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT pauljfons giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT xiaominwang giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT yutasaito giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT takashinakano giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT muneakihase giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT shuichimurakami giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT jensherfort giantmultiferroiceffectsintopologicalgetesb2te3superlattices AT yukihikotakagaki giantmultiferroiceffectsintopologicalgetesb2te3superlattices |