Nonferroelectric contributions to the hysteresis cycles in manganite thin films: A comparative study of measurement techniques

Fina, Ignasi; Fàbrega, L.; Langenberg, Eric; Martí, X.; Sánchez, F.; Várela, M.; Fontcuberta, J.

doi:10.1063/1.3555098

Cited by 107 publications

(98 citation statements)

References 12 publications

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“…It is, of course, possible to arrive at the intrinsic remanent polarization by subtracting the contribution of the polarization due to leakage current to the overall polarization obtained in the standard measurement protocol. The complete leakage current versus field profile can be used to calculate the polarization due to leakage using the framework proposed by Fina et al [18]. We also point out that in the remanent hysteresis loops (Fig.…”

Section: Resultsmentioning

confidence: 99%

Large magnetoelectric coupling in nanoscaleBiFeO3from direct electrical measurements

et al. 2014

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We report the results of direct measurement of remanent hysteresis loops on nanochains of BiFeO3 at room temperature under zero and ∼20 kOe magnetic field. We noticed a suppression of remanent polarization by nearly ∼40% under the magnetic field. The powder neutron diffraction data reveal significant ion displacements under a magnetic field which seems to be the origin of the suppression of polarization. The isolated nanoparticles, comprising the chains, exhibit evolution of ferroelectric domains under dc electric field and complete 180 o switching in switching-spectroscopy piezoresponse force microscopy. They also exhibit stronger ferromagnetism with nearly an order of magnitude higher saturation magnetization than that of the bulk sample. These results show that the nanoscale BiFeO3 exhibits coexistence of ferroelectric and ferromagnetic order and a strong magnetoelectric multiferroic coupling at room temperature comparable to what some of the type-II multiferroics show at a very low temperature.

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Section: Resultsmentioning

confidence: 99%

Large magnetoelectric coupling in nanoscaleBiFeO3from direct electrical measurements

et al. 2014

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“…[3][4][5] Therefore, determination of relaxed and intrinsic ferroelectric polarization in them is extremely difficult. [6][7][8][9] Depending on the resistivity and polarization of the sample, an appropriate technique needs to be developed in order to extract the tiny intrinsic and relaxed hysteretic or switchable polarization by eliminating stronger contributions from nonhysteretic (i.e., nonswitchable) and leakage components. The switchable polarization also consists of two components, namely, remanent and non-remanent.…”

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Determination of intrinsic ferroelectric polarization in lossy improper ferroelectric systems

Chowdhury

Goswami

Bhattacharya

et al. 2016

Applied Physics Letters

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We measured the intrinsic hysteretic polarization in lossy improper and nanoferroelectric systems where the nonhysteretic polarization and leakage are large and the relaxation takes place over a broader time scale. We used different measurement protocols such as standard single triangular voltage pulse, a pulse train of PUND (Positive Up Negative Down), and an even more complicated pulse train of fourteen voltage pulses and compared the results obtained. We show that a protocol which sends a train of fourteen pulses is more appropriate for extracting relaxed (i.e., time scale independent) and intrinsic remanent polarization for these samples. We also point out that it is possible to select and design an appropriate measurement protocol depending on the magnitude of polarization and leakage of the system. PACS numbers: 75.80.+q, 75.75.+a, 77.80.-e During the last decade and a half, the search for new multiferroic material with strong magnetoelectric coupling at room temperature remained at the forefront of research in magnetoelectric multiferroics. 1 The possibility of observing strong magnetoelectric coupling is higher in "improper" ferroelectrics than in systems with "proper" ferroelectricity. 2 However, intrinsic ferroelectric polarization is nearly two to three orders of magnitude smaller in improper ferroelectrics. This weak polarization is often masked with large leakage and contributions from nonferroelectric polarization. Moreover, coxisting ferroelectric, nonferroelectric, and conducting regions as well as large depolarizing field at the sample-electrode interface give rise to complicated domain switching kinetics and broader relaxation time scale. 3-5 Therefore, determination of relaxed and intrinsic ferroelectric polarization in them is extremely difficult. 6-9 Depending on the resistivity and polarization of the sample, an appropriate technique needs to be developed in order to extract the tiny intrinsic and relaxed hysteretic or switchable polarization by eliminating stronger contributions from nonhysteretic (i.e., nonswitchable) and leakage components. The switchable polarization also consists of two components, namely, remanent and non-remanent. In this Letter, we report that we have measured the intrinsic remanent polarization by taking care of the relaxation charactertics and seperating out different contributions to the total polarization using an appropriate measurement protocol. The intrinsic remanent polarization turns out to be, expectedly, independent of measurement time scale.We have used three distinctly different profiles of volta) Electronic mail: ujjalchowdhury1985@gmail.com b) Electronic mail: dipten@cgcri.res.in age pulses in the Sawyer-Tower circuit. The first one is the widely used single triangular wave. The second one is PUND (Positive Up Negative Down) and the third one is a special type of pulse profile known as remanent polarization measurement protocol. 10 For single triangular voltage pulse and remanent hysteresis measurement protocol, the loop tracer of Radiant Inc. was ...

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“…As a result, the polarization along the baxis of YNMO (P r(010) ) is near the double of the predicted values, which could ascribed to the discrepancy between the lattice parameters and strain measured in our films (Table 1)and the bulk values used in the theoretical predictions, keeping in mind that the P r(111) ≈3 µC/cm 2 could still have leakage contribution 46 . However, It can be also argued that the observed FE response, follows a scenario closer to the one described for Sm 2 NiMnO 6 in the same article, in which the applied external electric field generates a displacement on the oxygen atoms, breaking the centrosymetry of the material and thus promoting localised E*-type AFM regions in the sample.…”

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“…In PUND the current is measured while applying -++--voltage triangular pulse sequence, switchable polarization is obtained from the integration through time normalized to the electrode area of the current resulting from the subtraction of the current measured at the second (P-pulse) from the one measured at the third (U-pulse) and the one of the fourth (Npulse) one from the one of the fifth one (D-pulse). These measurements are described in detail in 46 .…”

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Dielectric characterization of multiferroic magnetoelectric double-perovskite Y(Ni0.5Mn0.5)O3 thin films

Coy

Fina

Ventura

et al. 2016

Applied Physics Letters

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We report on functional properties of Y(Ni 0.5 Mn 0.5 )O 3 epitaxial thin films, growth by pulsed laser deposition, observing clear features of its ferroelectric and ferromagnetic nature at cryogenic temperature. Temperature-dependent complex impedance spectroscopy (IS) characterization has shown a dielectric anomaly around the ferromagnetic Curie temperature ( 100 K) indicative of coupling between magnetic and electric orders.Multiferroic materials, those showing ferroelectric and anti-/ferromagnetic order, are being deeply studied because of their possible applicability to spintronics technology and others if significant coupling between both (named magnetoelectric coupling) exist In this paper, we focus on the multiferroic properties of YNMO perovskite epitaxial thin films grown by Pulsed Laser Deposition(PLD). We will investigate two set of films in order to access information along different directions: YNMO (001) Impedance data have been analysed in order to extract the intrinsic dielectric permittivity of the film, as further described in this article, following analyses described elsewhere 51,52 .Low temperature and under magnetic field measurements have been carried on a cryostat equipped with a superconducting magnet (Physical Properties Measurement System (PPMS), Quantum-Design Co.) Figure 1 shows the presence of (00l) family of planes reflections for the sample grown on STO(001) (Figure 1(a)), and (lll) for the one on STO(111) (Figure 1(b)). It can be also observed that there is no presence of any spurious phase meaning that the films are single phase. More detailed morphological and structural characterization can be found 5 elsewhere 40,53 , in which similar films are shown to be fully textured and epitaxial.Summarizing, the use of two different substrate orientations has allowed to obtain YNMO(001)/Nb:STO(001) and YNMO(111)/Nb:STO(111) films.

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Nonferroelectric contributions to the hysteresis cycles in manganite thin films: A comparative study of measurement techniques

Cited by 107 publications

References 12 publications

Large magnetoelectric coupling in nanoscaleBiFeO3from direct electrical measurements

Large magnetoelectric coupling in nanoscaleBiFeO3from direct electrical measurements

Determination of intrinsic ferroelectric polarization in lossy improper ferroelectric systems

Dielectric characterization of multiferroic magnetoelectric double-perovskite Y(Ni0.5Mn0.5)O3 thin films

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