Ferromagnetic Manganite Films

Abstract

We discuss the structure and electronic properties of ferromagnetic perovskite manganites with general formula Re 1− x Ae x MnO 3 (Re = La, Pr, Nd and Ae = Ca, Sr, Ba). These magnetic oxides being strongly correlated electronic systems show metal‐insulator and ferro‐paramagnetic phase transitions as well as charge/orbital ordering. Moreover, competition among charge, spin, and lattice degrees of freedom can lead to mesoscopic electronic inhomogeneity known also as electronic phase separation. Focusing on the magnetotransport properties in thin manganite films, we will show how the fundamental phenomena mentioned in the preceding text interplayed with specific thin‐film‐related characteristics like epitaxy stress, growth mode, and microstructure, govern various magnetoresistance (MR) effects—colossal magnetoresistance (CMR), tunneling, and anisotropic MR.

Polarization screening-induced magnetic phase gradients at complex oxide interfaces

“…D oped La 1 À x A x MnO 3 manganese perovskite oxides have received considerable attention for spintronic applications, since they offer many handles for structural control of magnetism and possess a relatively high ferromagnetic (FM) Curie temperature (T C E360 K) [1][2][3] . In these compounds, A is an alkaline earth such as Ba 2 þ , Sr 2 þ or Ca 2 þ ; for alloying in the range of 0oxo1, the charge state of Mn ions is between the nominal values, 3 þ and 4 þ (ref.…”

“…In these compounds, A is an alkaline earth such as Ba 2 þ , Sr 2 þ or Ca 2 þ ; for alloying in the range of 0oxo1, the charge state of Mn ions is between the nominal values, 3 þ and 4 þ (ref. 3). The electronic configuration for such a 3d Mn 3 þ d cation in an octahedral crystal field can be written as t 3 2g and e d g , where the magnitude of d depends on the concentration of x and the degree of hybridization with the neighbouring O 2p states in the MnO 6 octahedra.…”

“…The electronic configuration for such a 3d Mn 3 þ d cation in an octahedral crystal field can be written as t 3 2g and e d g , where the magnitude of d depends on the concentration of x and the degree of hybridization with the neighbouring O 2p states in the MnO 6 octahedra. In the present work, we focus specifically on the La 1 À x Sr x MnO 3 (LSMO) system at compositions near xE0.3, where double-exchange interactions dominate, e d g electrons become delocalized, and a completely spin-polarized FM ground state is stabilized 3 .…”

Ab initiostudy of magnetoelectric coupling in La0.66Sr0.33MnO3 / PbZr0.2Ti0.8O3multiferroic heterostructures

“…Multiferroic materials represent an emerging class of multifunctional materials that simultaneously exhibit ferroelectric and ferromagnetic (or antiferromagnetic) properties [1]. The magnetic properties of these materials can be controlled via the applied electric field, opening up a possibility of constructing novel types of magnetoelectric and spintronic devices [2,3]. Particularly attractive from the point of view of practical applications are nanoscale multiferroic heterostructures consisting of thin layers of ferromagnetic and ferroelectric perovskites [4].…”

Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

“…Weiteres bemerkenswertes Verhalten bestimmter Manganate ist ein von der elektrischen Vorgeschichte abhängiger Widerstand, was bedeutet, dass dieser durch den Fluss eines ausreichend großen Stromes von einem hohen in einen niedrigen Zustand und umgekehrt geschaltet werden kann; man spricht von einem Memristor [Kal+11;Mos+10]. Außerdem kann man unter besonderen Voraussetzungen in perowskitischen Metalloxiden sogar Supraleitung beobachten [Rey+07] und es gibt noch viele andere interessante Erscheinungen in dieser Materialklasse [MS07;Dag05].…”