Ferromagnetic resonance and electric characterization in double perovskite Sr2FeMoO6

Abstract

In this work the study of the ferromagnetic resonance (FMR) and of the electrical conductivity in the perovskite sample, Sr2FeMoO6, is presented. The sample has been manufactured by conventional ceramic method sintering in inert gas atmosphere. Electrical conductivity, of about 1000–1200 S/m, has been measured in the 125–300 K temperature range. FMR linewidths have been measured at 9.48 GHz from 125 to 300 K. A decrease of the linewidth with increasing temperature has been obtained. This behavior has been attributed to the presence of valence exchange mechanism, which takes places in samples with Fe2+ cations. In this way, FMR linewidth analysis has been revealed like a useful and clear technique in determining the cation distribution of the sample showing the presence of Fe2+ ions. This technique has also shown data about the microstructure of the sintered polycrystalline sample finding the porosity value of the sample.

Influence of successive sintering treatments on high ordered Sr2FeMoO6 double perovskite properties

“…For the first thermal treatment, the choice of the temperature and reaction atmosphere is very important. We used 1200 • C: in order to obtain high ordered double perovskite samples temperature is a determining factor; lower temperatures lead to disordered SFMO samples [7]; higher temperatures may produce molybdenum evaporation [11,12]. As reaction atmosphere we used a current flow of 10% H2-90% Ar.…”

“…Electrical behavior of SFMO is strongly influenced by the preparation conditions of the samples: metallic behavior [6,11,21,[31][32][33][34][35][36] or insulating-like variation [3,17,21,31,34,[37][38][39][40][41][42][43] of (T) have already been reported. The existence of samples with micrometerscale grains presenting a quasi-constant resistivity has never been mentioned, in our knowledge.…”

Затухание Спиновой Прецессии В Гетероструктурах Манганит/Нормальный Металл

“…Эти токи производят дополнительное изменение амплитуды магнитных полей переменного тока гетероструктуры. Влияние вихревых токов на ферромагнитный резонанс в проводимой ферромагнитной системе может привести к уширению ширины линии ФМР и изменению формы спектра ФМР в неоднородной области микроволновых полей [15][16][17]. Механизм даухмагнонного рассеяния приводит к связи режима равномерной прецессии с k = 0, возбужденной ФМР, с вырожденными конечно спин-волновыми модами [17,18].…”

“…Вихревой ток связан с потерей энергии из-за связи с электронами проводимости без привлечения тепловых магнонов. В случаях, когда глубина скин-слоя является большой по отношению к размеру структуры, потери на вихревые токи зависят от размера образца, проводимости и частоты [15,16,30].…”

Spin Interactions at the Interfaces Ferromagnetic Oxide/Ferromagnetic Intermetallic Superlattice

“…These currents produce an additional change in the amplitude of the alternating current magnetic fields of the heterostructure. The influence of eddy currents on ferromagnetic resonance in a conducting ferromagnetic system can lead to broadening of the FMR linewidth (ΔH E ) and to the change in the shape of the FMR spectrum at non-uniform microwave field [14][15][16]. The mechanism of two-magnon scattering leads to the connection of homogeneous precession (k = 0) with degenerate finite spin-wave modes [17,18].…”