Direct observation of finite size effects in chains of antiferromagnetically coupled spins

被引：31

作者：

Guidi, T. ^{[1
]}

Gillon, B. ^{[2
]}

Mason, S. A. ^{[3
]}

Garlatti, E. ^{[4
]}

Carretta, S. ^{[4
]}

Santini, P. ^{[4
]}

Stunault, A. ^{[3
]}

Caciuffo, R. ^{[5
]}

van Slageren, J. ^{[6
]}

Klemke, B. ^{[7
]}

Cousson, A. ^{[2
]}

Timco, G. A. ^{[8
,9
]}

Winpenny, R. E. P. ^{[8
,9
]}

机构：

[1] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[2] CEA Saclay, CNRS, CEA, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[4] Univ Parma, Dipartimento Fis & Sci Terra, I-43124 Parma, Italy

[5] European Commiss, Joint Res Ctr, Inst Transuranium Elements ITU, D-76125 Karlsruhe, Germany

[6] Univ Stuttgart, Inst Phys Chem, D-70569 Stuttgart, Germany

[7] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[8] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England

[9] Univ Manchester, Photon Sci Inst, Manchester M13 9PL, Lancs, England

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

基金：

英国科学技术设施理事会;

关键词：

MAGNETIZATION DENSITY; ATOMIC-SCALE; NANOMAGNETS; CLUSTER; DYNAMICS; WHEELS; STATES;

D O I：

10.1038/ncomms8061

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：

Finite spin chains made of few magnetic ions are the ultimate-size structures that can be engineered to perform spin manipulations for quantum information devices. Their spin structure is expected to show finite size effects and its knowledge is of great importance both for fundamental physics and applications. Until now a direct and quantitative measurement of the spatial distribution of the magnetization of such small structures has not been achieved even with the most advanced microscopic techniques. Here we present measurements of the spin density distribution of a finite chain of eight spin-3/2 ions using polarized neutron diffraction. The data reveal edge effects that are a consequence of the finite size and of the parity of the chain and indicate a noncollinear spin arrangement. This is in contrast with the uniform spin distribution observed in the parent closed chain and the collinear arrangement in odd-open chains.

引用

页数：6

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