Swift iodine ion modification of the structural and magnetotransport properties of Fe/Cr systems

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:267

Article; Proceedings Paper

Kac, M.¹  Zukrowski, J.²  Toulemonde, M.³  Kruk, R.⁴  Tokman, V.⁵  Polit, A.¹  Zabila, Y.¹  Dobrowolska, A.¹  Synashenko, O.⁶  Marszalek, M.¹ 

[1] Henryk Niewodniczanki Inst Nucl Phys PAN, PL-31342 Krakow, Poland

[2] Univ Sci & Technol AGH, Dept Solid State Phys, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland

[3] ENSICAEN, CIMAP GANIL, F-14070 Caen 05, France

[4] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[5] Natl Acad Sci Ukraine, Inst Appl Phys, Lvov, Ukraine

[6] Sumy State Univ, UA-40007 Sumy, Ukraine

关键词: Fe/Cr;    Multilayers;    Ion irradiation;    Interface roughness;    Magnetoresistance;    Antiferromagnetic coupling;   

DOI  :  10.1016/j.nimb.2009.02.024

来源: Elsevier

【 摘 要 】

Fe/Cr/Fe trilayers and (Fe/Cr)(20) multilayers prepared under ultrahigh vacuum conditions by thermal evaporation were irradiated with 200 MeV I13+, ions in the fluence range between 1 x 10(11) and 8 x 10(12) l/cm(2). The structural properties of the Fe/Cr/Fe trilayers and (Fe/Cr)20 multilayers were measured by X-ray reflectivity (XRR) and conversion electron Mossbauer-spectroscopy (CEMS). Magnetic exchange coupling between the Fe layers through the Cr spacer layer was observed by SQUID magnetization measurements. Magnetoresistance effect was measured using four probe method at room temperature. The XRR spectra showed an increase of the interface toughness versus increasing irradiation fluence in the multilayers, while in the trilayers smoothening of the interfaces in the sample irradiated with fluence equal to 4 x 10(11) l/cm(2) and very slight change for other fluences were observed. Improving of the interface structure in the trilayers at this fluence was observed also by CEMS. Moreover the Mossbauer spectra also confirm roughening of the interfaces as a function of fluence for multilayers. Before irradiation an antiferromagnetic coupling fraction dominated in all samples. After irradiation the changes of magnetic coupling were different in both types of samples. The trilayers were less sensitive to the irradiation fluence than multilayers and ail increase of the anti ferromagnetic fraction at small fluences was observed. In the multilayers a continuous decrease of the antiferromagnetic fraction as a function of fluence was evidenced. Vanishing of the antiferromagnetic coupling, observed for the largest fluence, resulted in the decrease of magnetoresistance effect in the Fe/Cr multilayers. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.

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