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Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces
Zhang, HR; Yan, X; Zhang, H; Wang, F; Gu, YD; Ning, XK; Khan, T; Li, R; Chen, YS; Liu, W; Wang, SF; Shen, BG; Sun, JR; Sun, JR (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China.; Sun, JR (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.; Sun, JR (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.; Wang, SF (reprint author), Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China.
2018-04-23
Source PublicationPHYSICAL REVIEW B
ISSN2469-9950
Volume97Issue:15Pages:-
AbstractSpin-polarized two-dimensional electron gas (2DEG) at the interface of two insulating perovskite oxides has been a focus of intensive studies in recent years. So far all attempts to construct magnetic 2DEG are based on the selection of an appropriate buffer layer or cap layer in SrTiO3-based heterostructures, and the magnetic effect thus produced on 2DEG is indirect and weak. Here, we fabricated the 2DEG based on Fe-doped SrTiO3 that is superparamagnetic rather than diamagnetic like SrTiO3. In addition to good metallicity, considerable Kondo effect, and negative magnetoresistance, the most striking observation of the present work is the occurrence of the anomalous Hall effect up to room temperature. This is transport evidence for the existence of spin-polarized 2DEG at high temperatures. As suggested by the monotonic increase of Curie temperature with carrier density, the magnetic exchange between magnetic ions could be mediated by the itinerant electrons of the 2DEG. The present work opens an avenue for the exploration of spin-polarized 2DEG.; Spin-polarized two-dimensional electron gas (2DEG) at the interface of two insulating perovskite oxides has been a focus of intensive studies in recent years. So far all attempts to construct magnetic 2DEG are based on the selection of an appropriate buffer layer or cap layer in SrTiO3-based heterostructures, and the magnetic effect thus produced on 2DEG is indirect and weak. Here, we fabricated the 2DEG based on Fe-doped SrTiO3 that is superparamagnetic rather than diamagnetic like SrTiO3. In addition to good metallicity, considerable Kondo effect, and negative magnetoresistance, the most striking observation of the present work is the occurrence of the anomalous Hall effect up to room temperature. This is transport evidence for the existence of spin-polarized 2DEG at high temperatures. As suggested by the monotonic increase of Curie temperature with carrier density, the magnetic exchange between magnetic ions could be mediated by the itinerant electrons of the 2DEG. The present work opens an avenue for the exploration of spin-polarized 2DEG.
description.department[zhang, hongrui ; yan, xi ; zhang, hui ; khan, tahira ; li, rui ; chen, yuansha ; shen, baogen ; sun, jirong] chinese acad sci, beijing natl lab condensed matter, beijing 100190, peoples r china ; [zhang, hongrui ; yan, xi ; zhang, hui ; khan, tahira ; li, rui ; chen, yuansha ; shen, baogen ; sun, jirong] chinese acad sci, inst phys, beijing 100190, peoples r china ; [zhang, hongrui ; yan, xi ; zhang, hui ; wang, fei ; gu, youdi ; khan, tahira ; li, rui ; chen, yuansha ; liu, wei ; shen, baogen ; sun, jirong] univ chinese acad sci, beijing 100049, peoples r china ; [wang, fei ; gu, youdi ; liu, wei] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [ning, xingkun ; wang, shufang] hebei univ, coll phys sci & technol, hebei key lab opt elect informat & mat, baoding 071002, peoples r china
KeywordZno Nanowires Magnetoresistance Ferromagnetism
Subject AreaPhysics, Condensed Matter
Funding OrganizationNational Basic Research of China [2016YFA0300701, 2017YFA030360]; National Natural Science Foundation of China [11520101002, 51590880, 11374348, 11674378]; Chinese Academy of Sciences
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79357
Collection中国科学院金属研究所
Corresponding AuthorSun, JR (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China.; Sun, JR (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.; Sun, JR (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.; Wang, SF (reprint author), Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, HR,Yan, X,Zhang, H,et al. Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces[J]. PHYSICAL REVIEW B,2018,97(15):-.
APA Zhang, HR.,Yan, X.,Zhang, H.,Wang, F.,Gu, YD.,...&Wang, SF .(2018).Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces.PHYSICAL REVIEW B,97(15),-.
MLA Zhang, HR,et al."Magnetic two-dimensional electron gases with high Curie temperatures at LaAlO3/SrTiO3:Fe interfaces".PHYSICAL REVIEW B 97.15(2018):-.
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