Atomic ordering in the LaFe0.5Mn0.5O3 solid solution film

Abstract

LaFe 0.5 Mn 0.5 O 3 solid solution films have been formed on SrTiO3 (111) substrates using a pulsed laser deposition technique and their magnetic properties have been examined. The films showed ferromagnetic (or ferromagnetic) behavior with a Curie temperature of 380 K and the saturation magnetization was estimated to be about 1.5μB per magnetic ion site (B site). The x-ray photoemission spectra indicated that this behavior was due to the partial ordering of magnetic ions (Fe and Mn ions) which is caused by the charge disproportion between Fe and Mn ions under the film formation conditions.

Role of vanadium content in ZnO thin films grown by pulsed laser deposition

“…Based on the theoretical studies for p-type III-V and II-VI DMS by Dietl et al [1], the researchers' attention has been focused on wide band gap semiconductors as prospective DMS for achieving magnetic ordering at ambient temperatures. The intrinsically n-type II-IV semiconductor ZnO that is already widely used in surface acoustic wave devices, gas sensors, microactuators and as a transparent conductive oxide appears to be a good starting point for investigating ZnO-based DMS [2][3][4]. The hole-mediated room temperature ferromagnetism in ZnO doped either with Mn or Co was confirmed experimentally [5,6].…”

Ferrimagnetism and spontaneous ordering of transition metals in double perovskite La2CrFeO6films

“…This so-called double-perovskite structure is expressed as A 2 M M O 6 , where A is an alkaline-or rare-earth element and M and M are different transition-metal elements. 2 Sr 2 Fe 3+ Mo 5+ O 6 and Sr 2 Cr 3+ Re 5+ O 6 are well-known examples owing to their half-metallic nature as well as exceptionally high T C . 3,4 For such ideal double perovskites, a large difference in the formal valence (FV) permits spontaneous ordering of transition-metal elements, thus facile to synthesize in a bulk form.…”

Co valence and possible spin transformation in diluted magnetic semiconductors Zn/sub 1-z/Mg/sub z/Co/sub 0.15/O and Zn/sub 1-x/Co/sub x/O

“…Reported experimental results on transition metal doped ZnO thin films are veIy controversial. Some groups observed room temperature ferromagnetism in Ni-, Co-doped thin films of ZnO [2,3], while many failed [4,5], Also no FM was observed in polycrystalline samples [6,7]. This controversy and poor reproducibility of the data suggests that origins of ferromagnetism in TM doped ZnO are yet to be understood.…”