Strong ferromagnetism at the surface of an antiferromagnet caused by buried magnetic moments

被引：36

作者：

Chikina, A. ^{[1
,2
]}

Hoeppner, M. ^{[1
,3
]}

Seiro, S. ^{[4
]}

Kummer, K. ^{[5
]}

Danzenbaecher, S. ^{[1
]}

Patil, S. ^{[1
]}

Generalov, A. ^{[1
]}

Guettler, M. ^{[1
]}

Kucherenko, Yu. ^{[1
,6
]}

Chulkov, E. V. ^{[7
,8
,9
]}

Koroteev, Yu. M. ^{[9
,10
]}

Koepernik, K. ^{[11
]}

Geibel, C. ^{[4
]}

Shi, M. ^{[12
]}

Radovic, M. ^{[12
,13
]}

Laubschat, C. ^{[1
]}

Vyalikh, D. V. ^{[1
,2
]}

机构：

[1] Tech Univ Dresden, Inst Solid State Phys, D-01062 Dresden, Germany

[2] St Petersburg State Univ, St Petersburg 198504, Russia

[3] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[4] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[6] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[7] Donostia Int Phys Ctr, Dept Fis Mat, San Sebastian 20080, Spain

[8] Univ Basque Country, CFM MPC, San Sebastian 20080, Spain

[9] Tomsk State Univ, Tomsk 634050, Russia

[10] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Tomsk 634021, Russia

[11] Leibniz Inst Festkorper & Werkstoffforsch Dresden, D-01171 Dresden, Germany

[12] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[13] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

关键词：

ELECTRON; ORDER; FERMIONS; SYSTEMS; STATES;

D O I：

10.1038/ncomms4171

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Carrying a large, pure spin magnetic moment of 7 mu B per atom in the half-filled 4f shell, divalent europium is an outstanding element for assembling novel magnetic devices in which a two-dimensional electron gas may be polarized due to exchange interaction with an underlying magnetically-active Eu layer. Here we show that the Si-Rh-Si surface trilayer of the antiferromagnet EuRh2Si2 bears a surface state, which exhibits an unexpected and large spin splitting controllable by temperature. The splitting sets in below similar to 32.5 K, well above the ordering temperature of the Eu 4f moments (similar to 24.5 K) in the bulk, indicating a larger ordering temperature in the topmost Eu layers. The driving force for the itinerant ferromagnetism at the surface is the aforementioned exchange interaction. Such a splitting may also be induced into states of functional surface layers deposited onto the surface of EuRh2Si2 or similarly ordered magnetic materials with metallic or semiconducting properties.

引用

页数：6

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