Interfacial spin glass mediated spontaneous exchange bias effect in self-assembled La0.7Sr0.3MnO3:NiO nanocomposite thin films

Panchal, Gyanendra; Choudhary, R. J.; Kumar, Manish; Phase, D. M.

doi:10.1016/j.jallcom.2019.05.033

Cited by 26 publications

(12 citation statements)

References 58 publications

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“…A cusp in M ( T ) appears in the ZFC cycle (blue star in Figure a), which moves toward low temperatures when the applied external magnetic field is increased and bifurcates (inset of Figure a) below the irreversibility temperature. This observation indicates a disordered spin-glass-like behavior, which is discussed in detail for the ST14 sample elsewhere . The magnetization behavior of the granular composite thin film LA7 is similar to the strained LSMO film with a reduced T C ∼ 243 K ( T 1 ) and with a feeble anomaly at T 2 around 210 K (shown by the dashed circle and also visible in the temperature derivative of the magnetization d M /d T shown in the inset of Figure a).…”

Section: Resultssupporting

confidence: 54%

“…It is desirable that LSMO (pseudocubic lattice parameter = 3.88 Å) grows epitaxially and forms the host matrix for the secondary phase NiO (epiphyte phase) because of a better crystallographic lattice matching with LAO and STO substrates. The epitaxy of thin films of LSMO on LAO/STO for s = 14 is published in a recent report which reveals that only the LSMO fraction in the composite films grows epitaxially on LAO/STO, whereas the growth of the NiO phase is highly textured. In such composite thin films, the details of formation of horizontal or vertical microstructures additionally depend on several parameters such as surface energy of evaporants and the substrate surface and relative phase fractions of the constituent phases .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterization of Vertically Aligned La_0.7Sr_0.3MnO₃:NiO Nanocomposite Thin Films for Spintronic Applications

Panchal

Panchwanee

Kumar

et al. 2020

ACS Appl. Nano Mater.

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The microstructures and interfaces of two-phase vertically aligned nanocomposite (VAN) thin films play a key role in the design of spintronic device architectures and their multifunctional properties. Here, we show how the microstructures in self-assembled VAN thin films of La0.7Sr0.3MnO3:NiO (LSMO:NiO) can be effectively tuned from nanogranular to nanocolumnar and to nanomaze by controlling the number of laser shots from the two constituent phase targets in the pulsed laser deposition (PLD) film growth. The observed microstructural induced strain is found to significantly enhance the magnetoresistance in a very broad temperature range between 10 and 240 K and to modulate the in-plane exchange bias (EB), with the largest EB value observed in the maximally strained heterostructures. Most interestingly, a unique perpendicular exchange bias (PEB) effect is also observed for these heterostructures with an enhanced PEB field of up to 230 Oe. X-ray magnetic circular dichroism and training effect measurements demonstrate that the observed EB is disorder-induced and arises due to the pinning of NiO uncompensated moments at the disordered interface which is ferromagnetically coupled with LSMO. Furthermore, systematic changes in the electronic structure across the vertical interface related to a variation of the Mn3+/Mn4+ content arise as a consequence of out-of-plane tensile strain.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Vertically Aligned La_0.7Sr_0.3MnO₃:NiO Nanocomposite Thin Films for Spintronic Applications

Panchal

Panchwanee

Kumar

et al. 2020

ACS Appl. Nano Mater.

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“…Furthermore, the exchange bias is found to increase with an increase in Mn amount in the NPs. The exchange bias values of Co@CoO core@shell dispersed in the Cu x O matrix (7780 Oe), porous Co/CoO composites (2800 Oe), MnO dispersed in Co (130 Oe), CoPt/CoO (1730 Oe), NiCo/NiCoO (anomalous behavior from +300 to −700 Oe depending on the oxygen amount), LaSrMnO 3 :NiO (260 Oe), α-Cr 2 O 3 @α-Fe 0.40 Cr 1.60 O 2.92 (362 Oe), Fe 3 O 4 @NiO (145 Oe), FePt@Mn x O y (about 150 Oe), and FePt@CoO (about 400 Oe) , were reported. Some system of proximity of ferromagnetics and antiferromagnetics such as Fe 3 O 4 @γ-Mn 2 O 3 and FePt@NiO did not show exchange bias. , This may be due to the low crystalline anisotropy effect from antiferromagnetic Mn 2 O 3 or NiO that could not lead unidirectional anisotropy spins.…”

Section: Results and Discussionmentioning

confidence: 99%

“…There are reports on exchange bias phenomena in core@shell such as Co@CoO and composites such as NiCo/NiCoO, Co/CoN, Co/MnO, Co 80 Ni 20 /oxide, CoPt/CoO, Fe 3 O 4 /FeO, LaSrMnO 3 /NiO, Fe/γ-Fe 2 O 3 , Fe/Fe x O, Ni/NiO, Cr 2 O 3 /CrO 2 , FeCo/CoFeO, FePt/MnO, FePt/Fe 3 O 4 , CoFe 2 O 4 @Mn, and Mn/Mn 3 O 4 . − The study shows the dependence of exchange bias ( H EB ) on temperature ( T ) where n = 1/2, 3/2... This suggests that H EB decreases with an increase in temperature, and also, it is dependent on power ( n ).…”

Section: Introductionmentioning

confidence: 99%

Insights into the Structural and Microscopic Origin of Magnetic Properties of the γ-Fe₂O₃@Mn_xO_y Nanostructure

et al. 2021

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Hetero-nanostructures having multi-layered ferromagnetic–antiferromagnetic ultrathin films, dispersion of ferromagnetic particles to the antiferromagnetic matrix, and a core–shell model (F@AF) can exhibit an exchange bias (H EB) that will be useful for spintronic materials such as spin valves, magnetic random-access memories, and ultrahigh data storage. The spin proximity effect of F and AF in the monodispersed core–shell is not much reported. For the first time, we report the preparation of core–shell monodispersed nanoparticles of γ-Fe2O3@Mn x O y having different thicknesses of shells. The microscopic origin of magnetic properties and the microscopic crystal structure are explained by experimental results such as energy-dispersive analysis of X-rays line scanning, X-ray absorption near-edge spectroscopy, and magnetic data. The values of H EB for γ-Fe2O3@Mn x O y (Mn6) and γ-Fe2O3@Mn x O y (Mn12) are found to be 8 and 79 Oe, respectively. Also, possible theoretical models such as crystal field stabilization energy for normal or inverse spinel structures and possible magnetic proximity interactions in core@shell models are discussed. Interestingly, samples show the heating behavior required for hyperthermia under an AC magnetic field, and materials will be potential for hyperthermia cancer therapy. Thermal decomposition of γ-Fe2O3@Mn x O y produces α-Fe2–2x Mn2x O3 at 550 °C, but their unit cell volumes are almost the same even after occupancy of 12 at. % Mn3+ in Fe3+ sites, and the origin of this behavior is explained for the first time.

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“…Pulsed laser deposition (PLD) as a thin film growth technique was not much popular until the late 1980s, when it has been used to grow superconducting YBa 2 Cu 3 O 7 -δ films [114]. Since then, the amount of research involving this technique has increased significantly and a number of compositions have been stabilized in thin film successfully [115][116][117][118][119][120][121][122]. The schematic of PLD system is shown in Figure 9.…”

Section: Mgo Thin Filmsmentioning

confidence: 99%

Bottom-Up and Top-Down Approaches for MgO

Singh¹,

Kumar²,

Sharma³

et al. 2020

Sonochemical Reactions

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In this chapter, we present an overview of synthesis of MgO nanoparticles and thin films by using top-down and bottom-up approaches. The bottom-up approaches are generally utilized to grow nanoparticles by the methods that involve chemical reactions. Sometimes, methods based on these reactions are also able to grow thin films. The top-down approaches are preferred for growing thin films where bulk material is used for depositions. The methods, which are frequently used, are radio frequency sputtering, pulsed lased deposition, and molecular beam epitaxy and e-beam evaporation. Sometimes, methods like mechanical milling and high energy ball milling are used to grow nanoparticles.

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Interfacial spin glass mediated spontaneous exchange bias effect in self-assembled La0.7Sr0.3MnO3:NiO nanocomposite thin films

Cited by 26 publications

References 58 publications

Synthesis and Characterization of Vertically Aligned La_0.7Sr_0.3MnO₃:NiO Nanocomposite Thin Films for Spintronic Applications

Synthesis and Characterization of Vertically Aligned La_0.7Sr_0.3MnO₃:NiO Nanocomposite Thin Films for Spintronic Applications

Insights into the Structural and Microscopic Origin of Magnetic Properties of the γ-Fe₂O₃@Mn_xO_y Nanostructure

Bottom-Up and Top-Down Approaches for MgO

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Interfacial spin glass mediated spontaneous exchange bias effect in self-assembled La0.7Sr0.3MnO3:NiO nanocomposite thin films

Cited by 26 publications

References 58 publications

Synthesis and Characterization of Vertically Aligned La0.7Sr0.3MnO3:NiO Nanocomposite Thin Films for Spintronic Applications

Synthesis and Characterization of Vertically Aligned La0.7Sr0.3MnO3:NiO Nanocomposite Thin Films for Spintronic Applications

Insights into the Structural and Microscopic Origin of Magnetic Properties of the γ-Fe2O3@MnxOy Nanostructure

Bottom-Up and Top-Down Approaches for MgO

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Product

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About

Synthesis and Characterization of Vertically Aligned La_0.7Sr_0.3MnO₃:NiO Nanocomposite Thin Films for Spintronic Applications

Synthesis and Characterization of Vertically Aligned La_0.7Sr_0.3MnO₃:NiO Nanocomposite Thin Films for Spintronic Applications

Insights into the Structural and Microscopic Origin of Magnetic Properties of the γ-Fe₂O₃@Mn_xO_y Nanostructure