Room temperature multiferroic effects in superlattice nanocapacitors

Dussan, S.; Kumar, Amit; Scott, J. F.; Priya, Shashank; Katiyar, Ram S.

doi:10.1063/1.3528210

Cited by 36 publications

(24 citation statements)

References 23 publications

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“…22,23 We have recently demonstrated the TER with large resistance ratios (up to 100:1) in heterostructures which mainly depends on the active device area. 24 The effect of magnetic fields on TER was also observed and was much greater with applied in-plane magnetic field.…”

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confidence: 99%

Ferroelectric capped magnetization in multiferroic PZT/LSMO tunnel junctions

Kumar

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et al. 2015

Applied Physics Letters

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Self-poled ultra-thin ferroelectric PbZr 0.52 Ti 0.48 O 3 (PZT) (5 and 7 nm) films have been grown by pulsed laser deposition technique on ferromagnetic La 0.67 Sr 0.33 MnO 3 (LSMO) (30 nm) to check the effect of polar capping on magnetization for ferroelectric tunnel junction (FTJ) devices.PZT/LSMO heterostructures with thick polar PZT (7 nm) capping show nearly 100% enhancement in magnetization compared with thin polar PZT (5 nm) films, probably due to excess hole transfer from the ferroelectric to the ferromagnetic layers. Core-level X-ray photoelectron spectroscopy studies revealed the presence of larger Mn 3s exchange splitting and higher Mn 3+ /Mn 4+ ion ratio in the LMSO with 7 nm polar capping.

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confidence: 99%

Ferroelectric capped magnetization in multiferroic PZT/LSMO tunnel junctions

Kumar

Barrionuevo

Ortega

et al. 2015

Applied Physics Letters

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“…The Fe +3 ions are known to cluster in pure PbFe 1/2 Nb 1/2 O 3 and PbFe 1/2 Ta 1/2 , which is responsible for the relatively high magnetic ordering temperature for only 15-20 % Fe-occupation of the B-site in our specimens. 43,44 The magnetization M(T) shows only one divergence (near 50 K) with no sign of a second phase or phase transition. It is worth mentioning that with increase in PFT contents (x=0.6) this system does not show any increased magnetic ordering; x= 0.4 possess low magnetization compare to x= 0.3.…”

Section: E Magnetization Studymentioning

confidence: 99%

“…The detailed growth conditions for the conducting LSMO were presented elsewhere. 44 One electrode was made of conducting silver paste whereas the other was LSMO. LSMO was purposely deposited on one side of the PZTFT to observe the high ME coupling due to the ferromagnetic (FE)-antiferromagnetic (AFM) interface.…”

Section: E Magnetization Studymentioning

confidence: 99%

Symmetries and multiferroic properties of novel room-temperature magnetoelectrics: Lead iron tantalate – lead zirconate titanate (PFT/PZT)

et al. 2011

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Mixing 60-70% lead zirconate titanate with 40-30% lead iron tantalate produces a single-phase, low-loss, room-temperature multiferroic with magnetoelectric coupling: (PbZr0.53Ti0.47O3) (1-x)- (PbFe0.5Ta0.5O3)x. The present study combines x-ray scattering, magnetic and polarization hysteresis in both phases, plus a second-order dielectric divergence (to epsilon = 6000 at 475 K for 0.4 PFT; to 4000 at 520 K for 0.3 PFT) for an unambiguous assignment as a C2v-C4v (Pmm2-P4mm) transition. The material exhibits square saturated magnetic hysteresis loops with 0.1 emu/g at 295 K and saturation polarization Pr = 25 μC/cm2, which actually increases (to 40 μC/cm2) in the high-T tetragonal phase, representing an exciting new room temperature oxide multiferroic to compete with BiFeO3. Additional transitions at high temperatures (cubic at T>1300 K) and low temperatures (rhombohedral or monoclinic at T<250 K) are found. These are the lowest-loss room-temperature multiferroics known, which is a great advantage for magnetoelectric devices

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“…Therefore, by employing a classical percolation theory, Mott's parameter, W = k B (T 0 T 3 ) 1/4 , is calculated from the slope (T 0 ) of R vs. T −1/4 plot [26], and its variation with temperature is shown in Fig. 5.…”

Section: Resultsmentioning

confidence: 99%