Detection of the magnetic and electric transitions by electron paramagnetic resonance and low-field microwave absorption in the magnetoelectric Pb(Fe0.5Ta0.5)O3

Detection of Magnetic Transitions by Means of Ferromagnetic Resonance and Microwave Absorption Techniques

“…fluctuations in the establishment of the long-range order that precedes the transition to antiferromagnetic order. When continuing diminishing the temperature, T<323 K, Hpp shows a weak increase until 294 K, this increase is indicative of a weak ferromagnetic behavior in the PFW; similar behaviors are observed in others magnetoelectric materials (Alvarez et al, 2006(Alvarez et al, , 2010(Alvarez et al, , 2012. Fig.…”

“…For all temperatures, LFMA signal exhibits two antisymmetric peaks about zero magnetic field, with opposed phase to EMR spectrum, and a clear hysteresis of this signal appears on cycling the field. This strongly contrasts with the LFMA signal observed in others magnetoelectric materials (Alvarez et al, 2007(Alvarez et al, , 2010(Alvarez et al, , 2012, where these absorptions are lineal and non-hysteretic. The hysteresis feature has been associated with low field magnetization processes in ferromagnetic materials (Montiel et al, 2004;Alvarez et al, 2010;Gavi et al, 2012), suggesting the presence of a magnetic component in the material (Fraygola et al, 2011).…”

“…As the temperature is decreased further, T<365 K, the slope decreases very fast with decreasing temperature until Tmin= 334 K; in this region the quantity of absorbing centers diminishes considerably due to the process of antiparallel spin alignment. Below Tmin, the slope has an approximately lineal increase, where this behavior is a signature of the weak ferromagnetism in this temperature region (Alvarez et al, 2007(Alvarez et al, , 2010(Alvarez et al, , 2012). …”

Synthesis and characterization of nanosized urchin-like α-Fe2O3 and Fe3O4: Microwave electromagnetic and absorbing properties

“…For this purpose, extensive studies have been carried out to exploit new and high efficient absorbents to prevent such phenomena. Among all the contenders, new type nanomaterials with complex nanostructures have attracted considerable attention owing to their unique chemical and physical properties [1][2][3][4][5][6], especially as microwave absorbing and shielding materials [7][8][9][10][11][12]. For example, Cao et al [8] prepared cagelike ZnO/SiO 2 nanocomposites with the maximal attenuation of 10.68 dB at 12.79 GHz.…”

Multiferroic behavior in glass–crystal nanocomposites containing Te2NiMnO6

“…These materials exhibited high dielectric constant with a reduced electrical leakage current. Electron paramagnetic resonance spectra were used to study the ferro-paraelectric and antiferro-paramagnetic transitions in the magnetoelectric material Pb(Fe 0.5 Ta 0.5 )O 3 [6]. Clear evidence of the presence of electric and magnetic orders was obtained by * Corresponding author.…”