Complex exchange coupling mechanisms in SRO/BFO/Fe heterostructures

Greculeasa, Simona; Schinteie, G.; Hrib, Luminiţa; Stancu, V.; Pasuk, Iuliana; Kuncser, Andrei; Kuncser, V.

doi:10.1016/j.jallcom.2018.09.208

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…To note the specific negative shifts of the hysteresis loops in the case of samples A and A200C, better evidenced after cooling the samples in an applied field. This well-known behavior is due to the presence of unidirectional anisotropy in a nanometer size ferromagnetic-like phase interfaced to an antiferromagnetic-like phase 30 – 32 . Among the macroscopic effects of such interfacial interactions are: (1) the increased coercivity of the multi-phase system and (2) the above mentioned shift of the hysteresis loop, denoted as an exchange bias field.…”

Section: Resultsmentioning

confidence: 99%

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Greculeasa

Palade

Schinteie

et al. 2020

Sci Rep

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Structural and magnetic properties of Fe oxide nanoparticles prepared by laser pyrolysis and annealed in high pressure hydrogen atmosphere were investigated. The annealing treatments were performed at 200 °C (sample A200C) and 300 °C (sample A300C). The as prepared sample, A, consists of nanoparticles with ~ 4 nm mean particle size and contains C (~ 11 at.%), Fe and O. The Fe/O ratio is between γ-Fe2O3 and Fe3O4 stoichiometric ratios. A change in the oxidation state, crystallinity and particle size is evidenced for the nanoparticles in sample A200C. The Fe oxide nanoparticles are completely reduced in sample A300C to α-Fe single phase. The blocking temperature increases from 106 K in A to 110 K in A200C and above room temperature in A300C, where strong inter-particle interactions are evidenced. Magnetic parameters, of interest for applications, have been considerably varied by the specific hydrogenation treatments, in direct connection to the induced specific changes of particle size, crystallinity and phase composition. For the A and A200C samples, a field cooling dependent unidirectional anisotropy was observed especially at low temperatures, supporting the presence of nanoparticles with core–shell-like structures. Surprisingly high MS values, almost 50% higher than for bulk metallic Fe, were evidenced in sample A300C.

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Section: Resultsmentioning

confidence: 99%

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Greculeasa

Palade

Schinteie

et al. 2020

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“…Among the available nanoarchitectures today, the two-dimensional (2D) F/AF bilayer systems are mostly used due to their simple preparation protocols and because they are excellent candidates for spin-valve applications [16]. They have been also mostly studied with respect to the dependence of the unidirectional anisotropy parameters on the magnetic and geometric characteristics of the interfaced F and AF layers [17][18][19][20]. Other zero-dimensional (0D) structures (e.g., core/shell nanoparticles) can be similarly synthesized through cost-effective chemical methods [21], being of large interest for the biomedical community [22].…”

Section: Introductionmentioning

confidence: 99%

Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes

et al. 2020

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We report the facile and low-cost preparation as well as detailed characterization of dense arrays of passivated ferromagnetic nickel (Ni) nanotubes (NTs) vertically-supported onto solid Au-coated Si substrates. The proposed fabrication method relies on electrochemical synthesis within the nanopores of a supported anodic aluminum oxide (AAO) template and allows for fine tuning of the NTs ferromagnetic walls just by changing the cathodic reduction potential during the nanostructures’ electrochemical growth. Subsequently, the experimental platform allowed further passivation of the Ni NTs with the formation of ultra-thin antiferromagnetic layers of nickel oxide (NiO). Using adequately adapted magnetic measurements, we afterwards demonstrated that the thickness of the NT walls and of the thin antiferromagneticNiO layer, strongly influences the magnetic behavior of the dense array of exchange-coupled Ni/NiO NTs. The specific magnetic properties of these hybrid ferromagnetic/antiferromagnetic nanosystems were then correlated with the morpho-structural and geometrical parameters of the NTs, as well as ultimately strengthened by additionally-implemented micromagnetic simulations. The effect of the unidirectional anisotropy strongly amplified by the cylindrical geometry of the ferromagnetic/antiferromagnetic interfaces has been investigated with the magnetic field applied both parallel and perpendicular to the NTs axis.

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“…The electric field control of magnetism requires deterministic control of the magnetic order, and the magnetoelectric coupling in multiferrous BiFeO 3 can be understood [23]. In addition, the others FE/MF heterostructured thin films and FE/MF(FE)/FE trilayered structural thin films were prepared [24][25][26][27], but these films still have a high leakage current density and a dissipation factor.In this work, Ba 0.65 Sr 0.35 TiO 3 , Bi 0.875 Nd 0.125 FeO 3 and Ba 0.65 Sr 0.35 TiO 3 -Bi 0.875 Nd 0.125 FeO 3 -Ba 0.65 Sr 0.35 TiO 3 thin films grown on Pt/Ti/SiO 2 /Si (100) substrates were prepared by radio frequency magnetron sputtering. The ferroelectric, ferromagnetic, and electrical properties of these film samples were investigated.…”

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Low Dielectric Loss and Multiferroic Properties in Ferroelectric/Mutiferroic/Ferroelectric Sandwich Structured Thin Films

2019

Coatings

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Bismuth ferrite (BiFeO 3 ) has proven to be promising for a wide variety of microelectric and magnetoelectric devices applications. In this work, a dense (Ba 0.65 Sr 0.35 )TiO 3 (BST)/ (Bi 0.875 Nd 0.125 )FeO 3 (BNF)/BST trilayered thin film grown on Pt-coated Si (100) substrates was developed by the rf-sputtering. For comparison, single-layered BNF and BST were also prepared on the same substrates, respectively. The results show that the dielectric loses suppression in BST/BNF/BST trilayered thin films at room temperature but has enhanced ferromagnetic and ferroelectric properties. The remnant polarization (P r ) and coercive electronic field (E c ) were 5.51 µC/cm 2 and 18.3 kV/cm, and the remnant magnetization (M r ) and coercive magnetic field (H c ) were 10.1 emu/cm 3 and 351 Oe, respectively, for the trilayered film. We considered that the bismuth's volatilization was limited by BST bottom layers making the Bi/Fe in good station, and the action of BST layer in the charge transfer between BNF thin film and electrode led to the quite low leakage current and enhanced multiferroic property. The origin of the mechanism of the highly enhanced dielectric constant and decreased loss tanδ was discussed.Coatings 2019, 9, 502 2 of 8 fields [21,22]. The electric field control of magnetism requires deterministic control of the magnetic order, and the magnetoelectric coupling in multiferrous BiFeO 3 can be understood [23]. In addition, the others FE/MF heterostructured thin films and FE/MF(FE)/FE trilayered structural thin films were prepared [24][25][26][27], but these films still have a high leakage current density and a dissipation factor.In this work, Ba 0.65 Sr 0.35 TiO 3 , Bi 0.875 Nd 0.125 FeO 3 and Ba 0.65 Sr 0.35 TiO 3 -Bi 0.875 Nd 0.125 FeO 3 -Ba 0.65 Sr 0.35 TiO 3 thin films grown on Pt/Ti/SiO 2 /Si (100) substrates were prepared by radio frequency magnetron sputtering. The ferroelectric, ferromagnetic, and electrical properties of these film samples were investigated. The low dielectric loss, low leakage current density, and multiferroic properties enhancement mechanism of the sandwich structural thin films are also discussed.

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Complex exchange coupling mechanisms in SRO/BFO/Fe heterostructures

Cited by 11 publications

References 42 publications

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Unidirectional Magnetic Anisotropy in Dense Vertically-Standing Arrays of Passivated Nickel Nanotubes

Low Dielectric Loss and Multiferroic Properties in Ferroelectric/Mutiferroic/Ferroelectric Sandwich Structured Thin Films

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