Electronic tuning of La2/3Sr1/3MnO3 thin films via heteroepitaxy

Wong, Franklin J.; Zhu, Shaobo; Iwata-Harms, Jodi; Suzuki, Yuri

doi:10.1063/1.3699047

Cited by 7 publications

(2 citation statements)

References 34 publications

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“…The large strain due to the lattice matching will decrease T C of the LSMO phase, because the double exchange interaction is weakened due to the strain-induced modifi cation in the Mn-O-Mn bond length and angle. [ 44 ] To further characterize the microstructures and the epitaxial nature of the composite fi lms, TEM study has been conducted. Figures 2 and 2 g show the typical EDS mapping of Mn (orange) and Ni (red) elements in the sample.…”

Section: Resultsmentioning

confidence: 99%

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Ning

Wang

Zhang

2014

Adv Funct Materials

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5393www.MaterialsViews.com wileyonlinelibrary.com environment. [ 9,10 ] Recently, due to the deepening cognition of the intrinsic and extrinsic GMR effect, growing attention has been paid to polycrystalline manganites to obtain the extrinsic low-fi eld magnetoresistance (LFMR) by structuring grain boundaries, nanosized inclusions, interface phase, and artifi cial grain boundaries. What's more, the LFMR in composites or fi lms can be further improved by introducing a secondary phase (usually non-magnetic or antiferromagnetic insulators). [11][12][13][14][15][16][17][18][19][20] For example, the LFMR values of -6% at 5 K and 0.16 T in LSMO:SrTiO 3 superlattice structure, [ 3 ] -17.5% at 30 K and 1 T in LSMO:ZnO columnar structure, [ 21 ] -8% at 10-150 K and 1 T in LSMO:MgO nanorod arrays structure [ 22 ] and -12% at 77 K and 0.4 T in LSMO:Ag 0-3 structure [ 23 ] have been reported. However, neither the early results obtained from LSMO polycrystalline fi lms [ 24 ] or recent results obtained from LSMO:ZnO composite fi lms with a columnar structure, [ 21 ] enhanced LFMR values are always display in a low temperature range. That may be due to the large grain size in polycrystalline fi lms (≈µm) or weak spin coupling at the phase boundaries in the composite thin fi lms. Systems featuring a large LFMR at temperatures close to or even higher than room temperature are also interesting owing to their potential applications in magnetic fi eld sensing and data storage. [ 25 ] Dey et al. have found that the large LFMR will keep steady in a higher temperature range when the grain size is in nanoscale and gets pronounced with the decrease in particle size. [ 26 ] It is notable that the spin pinned effect occurs at the nanosized grain surface defect sites or spin coupling at the boundaries. [ 26,27 ] In addition, the short range ferromagnetic (FM) coupling order may add the opportunity of spin scattering even near the Curie temperature. [ 28,29 ] Thus it is speculated that the high-temperature LFMR in LSMO composite fi lms can be got through tuning the grain size and the FM coupling at the phase boundary. MacManus-Driscoll et al. proposed that the self-assembled composite fi lms are free from substrate clamping constraints and form strained vertical interface areas which can be used to tune the FM coupling by another phase and also can provide a more fl exible way to control the growth of the fi lms which can be used to control the grain size to get enhanced physical properties. [ 30 ] To prepare the LSMO-based composite fi lms, on the one hand, it should NiO nano composite thin fi lms, which will be expected to be applied in the devices using for a wide temperature range.

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Section: Resultsmentioning

confidence: 99%

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Ning

Wang

Zhang

2014

Adv Funct Materials

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“…It is, in fact, found experimentally that the Ni-O-Mn FM interaction at the interface between LSMO and NiO weakens the double exchange interaction significantly [15], [16]. In addition to this, the NiO nanoparticles increase the magnetically disordered states and change the Mn-O-Mn bond length and angle and therefore the exchange energy decreased [17].…”

Section: Resultsmentioning

confidence: 91%

Exchange Bias Effect and Magnetic Properties in ${\hbox{La}}_{0.7}{\hbox{Sr}}_{0.3}{\hbox{MnO}}_{3}\hbox{-}{\hbox{NiO}}$ Nanocomposite Films

et al. 2014

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The magnetic exchange coupling effect has been investigated in La Sr MnO (LSMO)-NiO nanocomposite films prepared by pulsed laser deposition on SrTiO (001) and (110) single crystal substrates. The films show an enhanced coercivity field Oe compared with the same thickness single pure LSMO thin film. The composite films exhibit a large exchange bias field Oe after applying a 4000 Oe field cooling. The values of the exchange bias field decrease with increasing temperature and become zero at about 45 K, which corresponds to the conventional exchange bias blocking temperature ( ), regardless of epitaxial growth directions on (001) or (110) SrTiO substrates. We speculate that there may be magnetic interaction at the NiO and LSMO boundaries or charge transfer between the Ni and Mn ions, resulting in the formation of ferromagnetic interaction at the interface. The Curie temperature decreased from 340 K of the LSMO single film to 200 K of the nanocomposite film. The results demonstrate that the magnetic state of the composite film is directly related to the Mn-O-Mn and Mn-O-Ni spin interaction energy. In addition to this, the Mn-O-Ni at the boundary may also form the magnetic region that pins the ferromagnetic LSMO phase. Index Terms-Exchange bias (EB), magnetic transport properties, pulse laser deposition (PLD).

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Electrical transport and magnetic properties of epitaxial Nd0.7Sr0.3MnO
Gopalarao
¹
,
Ravi
²
,
Pamu
³

2016
Journal of Magnetism and Magnetic Materials
10
0
0
0
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Electronic tuning of La2/3Sr1/3MnO3 thin films via heteroepitaxy

Cited by 7 publications

References 34 publications

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Exchange Bias Effect and Magnetic Properties in ${\hbox{La}}_{0.7}{\hbox{Sr}}_{0.3}{\hbox{MnO}}_{3}\hbox{-}{\hbox{NiO}}$ Nanocomposite Films

Electrical transport and magnetic properties of epitaxial Nd0.7Sr0.3MnO
Gopalarao
¹
,
Ravi
²
,
Pamu
³

2016
Journal of Magnetism and Magnetic Materials
10
0
0
0
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Electronic tuning of La2/3Sr1/3MnO3 thin films via heteroepitaxy

Cited by 7 publications

References 34 publications

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La0.7Sr0.3MnO3:NiO Nanocomposite Films Modulated by Microstructures

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La0.7Sr0.3MnO3:NiO Nanocomposite Films Modulated by Microstructures

Exchange Bias Effect and Magnetic Properties in ${\hbox{La}}_{0.7}{\hbox{Sr}}_{0.3}{\hbox{MnO}}_{3}\hbox{-}{\hbox{NiO}}$ Nanocomposite Films

Electrical transport and magnetic properties of epitaxial Nd0.7Sr0.3MnOGopalarao1, Ravi2, Pamu3 2016Journal of Magnetism and Magnetic Materials10000View full textAdd to dashboardCite

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Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Electrical transport and magnetic properties of epitaxial Nd0.7Sr0.3MnO
Gopalarao
¹
,
Ravi
²
,
Pamu
³

2016
Journal of Magnetism and Magnetic Materials
10
0
0
0
View full text Add to dashboard Cite