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Ferromagnetic Resonance in Gd/Co Multilayer

Chinese Physics Letters 2001年第7期18卷 973-975页

作者： a.v.svalov J.M.Barandiarán v.O.vas’kovskiy G.v.Kurlyandskaya L.Lezama N.G.Bebenin J.Gutiérrez D.Schmool Ural State University Lenin Ave.51620083 EkaterinburgRussia Universidad del PaIs vasco UPv-EHU Facultad de Ciencias Apdo.64448080 BilbaoSpain Institute of Metal Physics Ural Division of RASKovalevskaya str.18GSP-170620219 EkaterinburgRussia Laboratory de Magnetisme et d’Optique ptique CNRSUniversitéde Versailles-Saint Quentin-CNRSBatiment Fermat45 Avenue des Etats-Unis78035 Versalles CedexFrance

Magnetometric and ferromagnetic resonance(MFR)measurements have been performed on the polycrystalline multilayered structure,[Gd(7.5 nm)/Co(3 nm)]*** temperature dependence of magnetization of the sample suggests a compensation temperature Tcomp in the region of 240 K,implying that the Co and Gd layers are antiferromagnetically *** FMR curves are strongly temperature dependent,particularly in the vicinity of Tcomp.

关键词： magnetization ferromagnetic polycrystalline

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Magnetic Behaviour of Tb/Si Nanoscale Multilayers with Small Thickness of Rare Earth Layers

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Chinese Physics Letters 2007年第6期24卷 1717-1719页

作者： A.v. svalov v.O. vas'kovskiy G.v. Kurlyandskaya J.M. Barandiaran N.N. Schegoleva A.N. Sorokin Ural State University Lenin Avenue 51 620083 Ekaterinburg Russia Universidad del Pals vasco UPv-EHU Facultad de Ciencias Depto Electricidad yVElectr6nica Apdo. 644'48080 Bilbao Spain Institute of Metal Physics Ural Branch of RAS Kovalevskaya str. 18 620219 Ekaterinburg Russia

We report the magnetic properties of Tb/Si multilayers obtained by rf-sputtering at the Tb layer thickness LTb = 3 nm. Analysis of the magnetization processes indicates more complex behaviour than canonical spinglass transition. It is more probable that these multilayers contain both Tb superparamagnetic particles and Tb-Si spin-glass alloys.

关键词： SPIN-GLASS TRANSITION GD/W MULTILAYERS TERBIUM FILMS NANOPARTICLES

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Interlayer Coupling in Co/Ti/（Gd-Co）/Ti Artificial Layered Ferrimagnet

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Chinese Physics Letters 2005年第12期22卷 3169-3172页

作者： A. v. svalov A. Fernández v. O. vas'kovskiy M. Tejedor R. Lopez Anton J. M. Barandiarán G. v. Kurlyandskaya Institute of Physics and Applied Mathematics Ural State University Lenin Avenue 51 620083 Ekaterinburg Russia Departamento de Fisica Universidad de Oviedo Avenida Calvo Sotelo s/n 33007 Oviedo Asturias Spain Departamento de Electricidad y Electronica Facultad de Ciencia y Tecnologia Universidad del Pais Vasco UPV/EHU PO Box 644 48080 Bilbao Spain

The magnetic properties and the structure of [Co/Ti/Gd0.36 Co0.64/Ti]4/Co multilayers are investigated by means of torque magnetometer, vibrating sample magnetometer and transverse magneto-optic Kerr effect （TMOKE） measurements and the atomic force microscopy. Due to interlayer exchange interaction, Co and Gd-Co layers form a macroscopic ferrimagnetic system. The change in the sign of the TMOKE hysteresis loops near the compensation temperature and field induced magnetic phase transitions are found. The latter can be characterized by a critical field which shows a linear variation with the temperature. The magnetic properties of these multilayers from many points of view are similar to those of bulk ferrimagnets.

关键词： THIN-FILMS MULTILAYERS

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Structural Peculiarities and Magnetic Properties of Nanoscale Terbium in Tb/Ti and Tb/Si Multilayers

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Chinese Physics Letters 2006年第1期23卷 196-199页

作者： A. v. svalov v. O. vas'kovskiy G. v. Kurlyandskaya J. M. Barandiaran I. Orue N. N. Schegoleva A. N. Sorokin Ural State University Lenin Avenue 51 620083 Ekaterinburg Russia Universidad del Pals vasco UPv-EHU Facultad de Ciencias Depto Electricidad y ElectrOnica Apdo. 644 48080 Bilbao Spain Institute of Metal Physics Ural Branch of RAS Kovalevskaya str. 18 620219 Ekaterinburg Russia

The structure and the magnetic properties of rf-sputtered nauoscale Tb in [Tb/Ti]n and [Tb/Si] multilayers have been studied experimentally. It is found that the structure of Tb layers changes, transforming from a fine-crystalline state of Tb into an amorphous state as the magnetic layer thickness decreases. The observed displacement of a magnetic ordering temperature to the lower temperature range and the shift of magnetic hysteresis obtained in the ZFC-FC terms may be caused by the size effect and the amorphization. Both the first and the second suppress the exchange interaction and decrease the crystalline magnetic anisotropy. The type of material of nonmagnetic spacers between the Tb layers plays a certain role in these changes.

关键词： FERROMAGNETIC-RESONANCE FILMS TEMPERATURE DEPENDENCE THICKNESS LAYERS

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