Crystallographic, electrical, and magnetic properties of the system La0.7Sr0.3Mn1−xFexO3

Abstract

On the basis of x-ray structural data and studies of the electrical, magnetic, and magnetoresistive properties and the ferromagnet resonance spectra of ceramic samples of La0.7Sr0.3Mn1−xFexO3 (0⩽x⩽0.10) it is established that a competition between structural changes influencing the ferromagnetism leads to a monotonic weakening of the ferromagnetism (a lowering of TC by around 5K∕%Fe). The increase of the magnetoresistance in the low-temperature region and the large values of the low-field contribution to the magnetoresistance are indicative of an inhomogeneous character of the electrical conductivity and magnetization of the samples at T<TC, which may be due to the coexistence of the ferro- and paramagnetic phases over a wide temperature region.

Phase separation, ferromagnetism and magnetic irreversibility in La1−xSrxMn1−yFeyO3

“…Investigations of LSMFO have revealed a high sensitivity of magnetic and transport properties to Fe doping [16][17][18][19][20]. In particular, it has been established a strong decrease of the FM Curie temperature, T C , with y, attributable to two different reasons [20].…”

(La,Sr)(Mn,Me)O3 manganites doped with d metals: Study of charge compensation mechanisms by crystallographic and magnetic characterizations

“…1b). With increasing iron content the shape of FMR spectra does not change considerably over a wide concentration range, 11 which corresponds to the dopant concentration limits for the model X (see Table 1). …”

Manganite Nanoparticles as Promising Heat Mediators for Magnetic Hyperthermia: Comparison of Different Chemical Substitutions

“…Ferromagnetic order in substituted manganites originates from the so-called double exchange interaction between Mn ions which are in different oxidation states (Mn 3+ and Mn 4+ ) [20]. Earlier, it was shown that Fe ions do not take part in the double exchange [12,13,21]. As a result, Fe substitution for Mn simply reduces the number of Mn ions participating in the double exchange.…”