Strain-dependent vacuum annealing effects in La0.67Ca0.33MnO3−δ films

Sun, J. R.; Yeung, C. F.; Zhao, Kun; Zhou, L.; Leung, C. H.; Wong, H. K.; Shen, B. G.

doi:10.1063/1.125971

Cited by 95 publications

(50 citation statements)

References 13 publications

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“…This phenomenon becomes apparent in thin films. The lattice strain (and stress) accumulated during epitaxial growth of a film plays an important role in the formation of the spin-and the charge-ordered states, the metal-insulator transition temperature, and the value of magnetoresistance [2][3][4].The effect of the kind of single-crystal substrate on the magnetic and the electronic properties of manganite films has been investigated well [5,6]. On the other hand, to develop hybrid devices based on multilayered CMR films detailed information on the mutual influence between constituent layers is required.…”

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confidence: 99%

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Magnetic and transport properties of La0.8Sr0.2MnO3/La0.8Ca0.2MnO3 bilayer

Prokhorov

Kaminsky

Komashko

et al. 2003

Low Temperature Physics

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The effects of lattice strain on the magnetic and the transport properties of La Sr MnO Doped colossal-magnetoresistance (CMR) manganite perovskites exhibit a strong correlation between their lattice structure and magneto-transport properties [1]. This phenomenon becomes apparent in thin films. The lattice strain (and stress) accumulated during epitaxial growth of a film plays an important role in the formation of the spin-and the charge-ordered states, the metal-insulator transition temperature, and the value of magnetoresistance [2][3][4].The effect of the kind of single-crystal substrate on the magnetic and the electronic properties of manganite films has been investigated well [5,6]. On the other hand, to develop hybrid devices based on multilayered CMR films detailed information on the mutual influence between constituent layers is required. It is expected that the magnetic and the transport properties of a multilayer structure can substantially differ from those of the individual films of the constituent layers. In this work we report experimental results for La Sr MnO 3 bilayer (BL). All films were prepared by rf magnetron sputtering using a so-called «soft» (or powder) target [7]. The total pressure in the chamber was 5 10 2 × -Torr with a 3:1 Ar-O 2 gas mixture. The substrate was a LaAlO 3 (001) single crystal (LAO) with an out-of-plane lattice parameter c 0.379 nm for pseudocubic symmetry. The substrate temperature during deposition was 750°C. Both LSM and LCM films were deposited with a thickness d 60 nm, and the BL was deposited with the same thickness for each layer and with LSM on top. The q-2q x-ray diffraction (XRD) patterns were obtained using a Rigaku diffractometer and CuK a radiation. The lattice parameters evaluated directly from the XRD data were plotted against cos sin 2 q q /. A more precise determination of the lattice parameter was obtained extrapolating a straight line to cos sin 2 0 q q / = . The resistance measurements were carried out using the four-probe method in the temperature range of 4.2-300 K and a magnetic fields up to 5 T. The magnetization in a field up to 100 Oe and the susceptibility at 500 Hz were obtained with a Quantum Design SQUID magnetometer in the temperature range of 4.2-300 K. Figure 1,a presents the q-2q XRD scans for LSM (curve 1), LCM (curve 2) and BL (curve 3) films. The high intensities of the (00l) peaks show that the deposition results in highly c-oriented films. Figure 1,b shows that the location of the (002) Bragg peak for the BL is almost coincident with that for the LCM film. In contrast, the peak for the LSM film is dis-

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confidence: 99%

“…The effect of the kind of single-crystal substrate on the magnetic and the electronic properties of manganite films has been investigated well [5,6]. On the other hand, to develop hybrid devices based on multilayered CMR films detailed information on the mutual influence between constituent layers is required.…”

mentioning

confidence: 99%

Magnetic and transport properties of La0.8Sr0.2MnO3/La0.8Ca0.2MnO3 bilayer

Prokhorov

Kaminsky

Komashko

et al. 2003

Low Temperature Physics

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“…It was reported that the oxygen deficiency had dramatic effect on the electrical transport and magnetic properties of hole-doped manganites [4][5][6][7][8][9][10][11][12].…”

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confidence: 99%

The effect of oxygen stoichiometry on electrical transport and magnetic properties of La0.9Te0.1MnOy

Yang¹,

Song²,

Zhang³

et al. 2004

Solid State Communications

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“…This suggests that the incipient crystalline phase grows in equilibrium conditions without a significant influence of the substrate and is formed through the amorphous state. The LCM3 film, deposited at a high temperature, displays intense Bragg peaks with a larger out-of-plane lattice parameter, c ; 0.3927 nm, that is typical for the thin CMR films and explained by the accumulation of an in-plane biaxial compressive strain during the deposition [7,8,12,15]. Figure 2,a is the high-magnification cross-sectional HREM image for the amorphous LCM1 film.…”

Section: Microstructure Of the Filmsmentioning

confidence: 99%

“…It was found recently that the lattice strain (and stress), accumulated owing to the epitaxial growth of a film, plays an important role in the formation of the spinand charge-ordered states in the CMR films [3][4][5][6]. The influence of the kind of single-crystalline substrates on the magnetic and electronic properties of manganite films has been quite will investigated [7,8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and transport properties controlled by structural disorder in La0.7Ca0.3MnO3 films

Prokhorov

Komashko

Kaminsky

et al. 2004

Low Temperature Physics

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The magnetic properties of an amorphous, a partially-disordered, and a lattice-strained crystalline La 07 . Ca 03 . MnO 3 film are investigated. It is shown that the amorphous film exhibits Curie-Weiss-type paramagnetism with the effective magnetic moment of 4.2 m B /Mn ion and a small ferromagnetic contribution governed by the formation of a quasi-two-dimensional crystalline interfacial inclusions. The crystalline film with nanocrystalline randomly-oriented inclusions demonstrates a superposition of ferromagnetic (in the crystalline matrix) and superparamagnetic (in the inclusions) nature. The fitted average size of the superparamagnetic particles in the case of a Langevin function is coincident with that of the nanocrystalline clusters reveated in high-resolution electron-microscopy images. An increase in the applied magnetic field leads to a reduction in the average magnetic moment of superparamagnetic particles, which is due to an enhancement of the ferromagnetic coupling between the individual randomly-oriented crystallites. The completely crystalline film undergoes only a ferromagnetic transition with a saturation magnetization at 5 K of 2.73 m B /Mn ion.

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Strain-dependent vacuum annealing effects in La0.67Ca0.33MnO3−δ films

Cited by 95 publications

References 13 publications

Magnetic and transport properties of La0.8Sr0.2MnO3/La0.8Ca0.2MnO3 bilayer

Magnetic and transport properties of La0.8Sr0.2MnO3/La0.8Ca0.2MnO3 bilayer

The effect of oxygen stoichiometry on electrical transport and magnetic properties of La0.9Te0.1MnOy

Magnetic and transport properties controlled by structural disorder in La0.7Ca0.3MnO3 films

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