Colossal-magnetoresistive manganite thin films

Prellier, W.; Lecoeur, Ph.; Mercey, B.

doi:10.1088/0953-8984/13/48/201

Cited by 257 publications

(238 citation statements)

References 255 publications

(465 reference statements)

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“…As previously stated, the physical properties of magnetic thin films (Mn-based system) are strongly dependent on the strains imposed by the substrate 28 . This dependence has also been reported in the case of SRO thin films 29 where a SRO is larger than a ST O which indicates the presence of compressive in-plane stress on the SRO film.…”

Section: (A)mentioning

confidence: 94%

Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

2004

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Magnetic multilayers of (SrRuO 3 ) m (SrM nO 3 ) n were grown artificially using the pulsed laser deposition technique on (001)-oriented SrT iO 3 substrates.The state of strain at the interfaces and the structural coherency are studied in details utilizing asymmetrical X-ray diffraction and the sin 2 ψ method.First, the evolution of the lattice parameters, the crystallinity and the epitaxy of the films are evaluated as a function of the number of SrM nO 3 unit cells using X-rays diffraction and transmission electron microscopy. Second, our results on the stress indicate that the SrRuO 3 /SrM nO 3 superlattices show a larger residual strain as compared to the single layer film of SrRuO 3 . This suggests that the lattice stiffening from interfacial strain and inhibiting the dislocation by composition modulation. Finally, these results bring insights on the interfacial stress measurements of oxide multilayers that can be used to control the physical properties at the level of the atomic scale. * prellier@ismra.fr

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Section: (A)mentioning

confidence: 94%

Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

2004

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“…In these regards there had been some trials in literature [4][5][6]. For example by increasing the amount of Mn 4+ through substitutions like RE/Ag [4,5], or increase in overall oxygen content [1,7], one could shift the T MI and T FM above/close to the room temperature. However one needs not only the room temperature T MI and T FM but sharper MI and FM transitions for meaningful MR at these temperature.…”

Section: Introductionmentioning

confidence: 99%

Magneto-transport of high TCR (temperature coefficient of resistance) La2/3Ca1/3MnO3 : Ag polycrystalline composites

Awana

Tripathi

Balamurugan

et al. 2006

Solid State Communications

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We report the synthesis, (micro)structural, magneto-transport and magnetization of polycrystalline La 2/3 Ca 1/3 MnO 3 :Ag x composites with x = 0.0, 0.1, 0.2, 0.3 and 0.4. The temperature coefficient of resistance (TCR) near ferromagnetic (FM) transition is increased significantly with addition of Ag. The FM transition temperature (T FM ) is also increased slightly with Ag addition. Magneto-transport measurements revealed that magneto-resistance MR is found to be maximum near T FM . Further the increased MR of up to 60% is seen above 300 K for higher silver added samples in an applied field of 7 Tesla. Sharp TCR is seen near T FM with highest value of up to 15 % for Ag (0.4) sample, which is an order of magnitude higher than as for present pristine sample and best value yet reported for any polycrystalline LCMO compound. Increased TCR, T FM and significant above room temperature MR of La 2/3 Ca 1/3 MnO 3 :Ag x composites is explained on the basis of improved grains size and connectivity with silver addition in the matrix. Better coupled FM domains and nearly conducting grain boundaries give rise to improved physical properties of the La 2/3 Ca 1/3 MnO 3 manganites. Ag composites Ag is not substituted into main LCMO lattice but remain rather as an additive in the system. (280 K) is comparable to aligned thin films [6,8,15] of LCMO, and to our knowledge is the best one yet obtained for any polycrystalline mangenites. As far fixed temperature and varying field MR is concerned its shape is changed from U type to V type. And is maximum at all fields up to 7 Tesla at 300 K. Infact with an increase in Ag content the low T below 300K MR% decrease and the room temperature 300 K increase. For LCMO: Ag (0.4) sample the MR of up to 60% is observed in 7 Tesla field at 300 K. Even at low fields of say 1 Tesla the MR of up to 16% is seen.The results of magnetization and magneto transport of LCMO:Ag x composites can be summarized as follows: 7 1. Ag does not substitute into host LCMO matrix in our polycrystalline LCMO:Ag x composites but improved significantly the grain morphology of the host.2. The T MI and T c remain nearly invariant with increase in x (Ag content).3. The sharpness of insulator-metal transition increases dramatically with increase in x (Ag content) and high (15%) sharp TCR is observed for Ag composites 4. Though the MR is seen in all the samples right from 300 K down to 5 K, the same is negligible at 300 K and more at lower T for pure sample and is maximum at 300 K and least at 5 K for Ag (0.4) containing compounds. DISCUSSIONNow we try to explain in broad sense the main results summarized above, as far as (1) is concerned there are some very recent reports in literature, which deals with the LCMO and LCMO/ZrO 2 [20]. In all these composites the quality of the LCMO was deteriorated. In case of LCMO:Ag there is a good probability of Ag being distributed at grain boundaries and hence providing better connectivity of grains, which is seen in Fig. 2(b). In most of other composites [16][17][18][19][20] the addi...

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“…The occurrence of the hump and the corresponding double peaks in TCR and LFMR could possibly be due to the re-enforcement of the CO-AFMI phase due to oxygen deficiency and inhomogeneous strain. The films on STO are, as discussed earlier, under tensile strain, which favors the CO-AFMI phase and is inimical to the FMM [11]. This enhances magnetic phase fluctuations that increases the carrier scattering resulting in (i) T C >T IM , (ii) relatively broad IMT, (iii) the observed hump like feature in the (T) curve at T<T IM and (iv) the lower peak in the TCR and MR.…”

Section: Resultsmentioning

confidence: 75%

“…The lower T C /T IM in S47 is due to the presence of tensile strain that favours CO-AFM rather than FM ones [11]. However, it is interesting to note that at smaller magnetic fields (<500 Oe) the magnetic moment of L47 are smaller than that of S47 and the reverse is true at higher fields.…”

Section: Resultsmentioning

confidence: 93%

“…One of the possible reasons being the difficulty in growth of thin films with well controlled behaviors, due to the extreme sensitivity of the electronic phases to the substrate induced pseudomorphic strains. It is known that the compressive strain favours FMM and is inimical to the AFM-COI phases while the tensile strain enhances the later at the cost of the former [11]. However, thin films even on (001) LaAlO 3 (LAO) substrate which provides compressive strain, have not been reported in literature so far.…”

Section: Introductionmentioning

confidence: 99%

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Impact of substrate on magnetic phase coexistence in bicritical Sm0.53Sr0.47MnO3 thin films

Srivastava

Singh

Siwach

et al. 2012

Solid State Communications

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Sm 0.53 Sr 0.47 MnO 3 thin films were deposited on single crystal LaAlO 3 (LAO/(001)) and SrTiO 3 (STO/(001)) substrates by DC magnetron sputtering. The -2 and -2 scans show that these films have very good crystallinity and the films on LAO and STO are under compressive and tensile strain, respectively. The films on LAO and STO substrates show ferromagnetic (insulator-metal) transition at T C~1 26 K (at T IM~1 28 K) and 120 K (T IM~1 17K), respectively.The magnetic state at T

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Colossal-magnetoresistive manganite thin films

Cited by 257 publications

References 255 publications

Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

Magneto-transport of high TCR (temperature coefficient of resistance) La2/3Ca1/3MnO3 : Ag polycrystalline composites

Impact of substrate on magnetic phase coexistence in bicritical Sm0.53Sr0.47MnO3 thin films

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