Magnetic and ferroelectric properties of Fe doped SrTiO<sub>3-δ</sub>films

Experimentally the polarization P and the magnetization M of BaTiO3 (BTO) nanoparticles are altered under doping with transition metals as Fe‐ions. Using a modified spin model for the magnetic and the ferroelectric part as well as the magnetoelectric coupling we have calculated the dependence of M and P on the Fe‐doping content in BTO nanoparticles. The ferroelectric and ferromagnetic phase transition temperatures, Tcfe and Tcfm, are likewise shifted due to doping. Owing to surface effects the influence of doping could be stronger compared to the bulk behavior. Whereas M and Tcfm increase with increasing Fe‐ion concentration, P and Tcfe decrease if the dopant concentration is enhanced.

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“…Mn‐doping of BTO leads also to enhanced magnetization (). A similar increase of M with x is reported for Fe‐doped SrTiO

_{3}

thin films ().…”

Section: Numerical Results and Discussionsupporting

confidence: 84%

“…This could explain the increasing of the saturated magnetization with x. Mn-doping of BTO leads also to enhanced magnetization [25]. A similar increase of M with x is reported for Fe-doped SrTiO 3 thin films [26].…”

supporting

confidence: 54%

Enhancement of the magnetoelectric effect in doped BaTiO3 nanoparticles

Apostolov

Apostolova

Bahoosh

et al. 2015

Phys. Status Solidi B

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“…Thus, the Fe substituting is a quite feasible approach to promote the ferroelectric properties in SrTiO 3 . However, we can find only a little research about the ferroelectric properties of the Sr(Ti 1− x Fe x )O 3 films [21,22,23], and the influence of Fe substitution concentration on the ferroelectric and leakage current behavior of the sol-gel derived Sr(Ti 1− x Fe x )O 3 thin films has not been reported still now.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

et al. 2017

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Sr(Ti1−xFex)O3−δ (0 ≤ x ≤ 0.2) thin films were grown on Si(100) substrates with LaNiO3 buffer-layer by a sol-gel process. Influence of Fe substitution concentration on the structural, ferroelectric, and magnetic properties, as well as the leakage current behaviors of the Sr(Ti1−xFex)O3−δ thin films, were investigated by using the X-ray diffractometer (XRD), atomic force microscopy (AFM), the ferroelectric test system, and the vibrating sample magnetometer (VSM). After substituting a small amount of Ti ion with Fe, highly enhanced ferroelectric properties were obtained successfully in SrTi0.9Ti0.1O3−δ thin films, with a double remanent polarization (2Pr) of 1.56, 1.95, and 9.14 μC·cm−2, respectively, for the samples were annealed in air, oxygen, and nitrogen atmospheres. The leakage current densities of the Fe-doped SrTiO3 thin films are about 10−6–10−5 A·cm−2 at an applied electric field of 100 kV·cm−1, and the conduction mechanism of the thin film capacitors with various Fe concentrations has been analyzed. The ferromagnetic properties of the Sr(Ti1−xFex)O3−δ thin films have been investigated, which can be correlated to the mixed valence ions and the effects of the grain boundary. The present results revealed the multiferroic nature of the Sr(Ti1−xFex)O3−δ thin films. The effect of the annealing environment on the room temperature magnetic and ferroelectric properties of Sr(Ti0.9Fe0.1)O3−δ thin films were also discussed in detail.

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“…There are also some reports on transition metal ion doped SrTiO 3 :M (M ¼Mn, Fe, Cr) which exhibits ferromagnetic behavior though the bulk material is diamagnetic [7][8][9]. However, reports on multifunctional SrTiO 3 material exhibiting both ferromagnetic and ferroelectric properties are scarce [10]. Recent emphasis on such materials stems from their potential application in multiple state memory elements [11].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, we have investigated the effect of doping Bi 3 þ as well as Fe 3 þ ions on the magnetic and ferroelectric properties of nanostructured SrTiO 3 . The choice of dopant ions was based on the fact that the stereochemical activity of the lone pair of the large and highly polarizable Bi 3 þ ions would induce ferroelectricity while Fe 3 þ ions would impart some magnetic character to SrTiO 3 [10,12].…”

Section: Introductionmentioning

confidence: 99%