Strain-mediated elastic coupling in magnetoelectric nickel/barium-titanate heterostructures

Streubel, Robert; Köhler, Denny; Schäfer, Rudolf; Eng, Lukas M.

doi:10.1103/physrevb.87.054410

Cited by 52 publications

(36 citation statements)

References 32 publications

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“…Other promising strategies to locally tailor the magnetic properties of a continuous magnetic medium exploit either exchange coupling with a multiferroic BiFeO 3 layer [13][14][15][16] or strain coupling to the ferroelastic domains of a ferroelectric BaTiO 3 substrate * sebastiaan.van.dijken@aalto.fi [17][18][19][20][21][22][23]. Although stemming from different mechanisms, both latter approaches result in one-to-one correlations between the domains in BiFeO 3 or BaTiO 3 and the domains of an adjacent ferromagnetic film.…”

Section: Introductionmentioning

confidence: 99%

Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

Casiraghi¹,

Rincón-Domínguez²,

Rößler³

et al. 2015

Phys. Rev. B

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In elastically coupled multiferroic heterostructures that exhibit full domain correlations between ferroelectric and ferromagnetic subsystems, magnetic domain walls are firmly pinned on top of ferroelectric domain boundaries. In this work, we investigate the influence of pinned magnetic domain walls on the magnetization reversal process in a Co 40 Fe 40 B 20 wedge film that is coupled to a ferroelectric BaTiO 3 substrate via interface strain transfer. We show that the magnetic field direction can be used to select between two distinct magnetization reversal mechanisms, namely, (1) double switching events involving alternate stripe domains at a time or (2) synchronized switching of all domains. Furthermore, scaling of the switching fields with domain width and film thickness is also found to depend on the field orientation. These results are explained by considering the dissimilar energies of the two types of pinned magnetic domain walls that are formed in the system.

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Section: Introductionmentioning

confidence: 99%

Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

Casiraghi¹,

Rincón-Domínguez²,

Rößler³

et al. 2015

Phys. Rev. B

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“…This indicates that the magnetization process is strongly coupled to the ferroelectric domain structures. In the present case, the combination of in‐plane head‐head, tail‐tail and head‐tail domains oriented along [100] pc , [010] pc , and [001] pc with 90° and 180° arrangement makes (110) plane highly complex . When a large E above the E C (±5 kV cm −1 ) is applied, the projections of polarization vectors along either [100] pc or [‐100] pc , [010] pc or [0‐10] pc and [001] pc or [00‐1] pc are fundamentally different for positive and negative applied electric fields.…”

mentioning

confidence: 61%

Magnetization Reversal in Fe/BaTiO₃(110) Heterostructured Multiferroics

Venkataiah

Swain

Komatsu

et al. 2017

Physica Rapid Research Ltrs

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Magnetization reversal has been demonstrated in an Fe layer grown on BaTiO3(110) single crystal substrate by utilizing the interface magnetic anisotropy induced by lattice strain and a small magnetic field bias. The polar plots of normalized remanent magnetization show isotropic nature at room temperature (293 K), while those at 230 and 175 K exhibit twofold symmetry with the easy axis oriented along [‐111]pc of BaTiO3. Cooling and heating cycles in the range of 150–325 K in an applied magnetic field of −35 Oe along [‐111]pc enable to achieve the deterministic 180° magnetization reversal, where distinct magnetic anisotropies of Fe associated with different structural phases of BaTiO3 will be the driving force that induces the magnetization reversal. Electric field dependence of the magnetic coercivity shows hysteric behavior, which we attribute to the combined interfacial effect of magnetization rotation in Fe and ferroelectric polarization switching in BaTiO3.

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“…For a given applied voltage polarity, which is predefined by the poling procedure of the piezo-substrate, relation (2) indicates that the anisotropy field can be both increased and decreased depending on the materials parameters that dictate the signs of k s and d 31 , as also shown by Streubel et al in studies of Ni/BaTiO 3 composite multiferroics. 19 Assuming a negative applied voltage, a reduction in the anisotropy field can be achieved when both magneto-striction coefficient and the piezoelectric coefficient have the same sign (either negative or positive). When the two parameters have opposing signs, the effect is an increase in the anisotropy field.…”

Section: Theorymentioning

confidence: 99%

Multiferroic composites for magnetic data storage beyond the super-paramagnetic limit

Vopson

Zemaityte

Spreitzer

et al. 2014

Journal of Applied Physics

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FePt -TiO 2 exchange coupled composite media with well-isolated columnar microstructure for high density magnetic recording Effect of orientation on the thermal stability in advanced metal particulate tapes Ultra high-density magnetic data storage requires magnetic grains of <5 nm diameters. Thermal stability of such small magnetic grain demands materials with very large magneto-crystalline anisotropy, which makes data write process almost impossible, even when Heat Assisted Magnetic Recording (HAMR) technology is deployed. Here, we propose an alternative method of strengthening the thermal stability of the magnetic grains via elasto-mechanical coupling between the magnetic data storage layer and a piezo-ferroelectric substrate. Using Stoner-Wohlfarth single domain model, we show that the correct tuning of this coupling can increase the effective magnetocrystalline anisotropy of the magnetic grains making them stable beyond the super-paramagnetic limit. However, the effective magnetic anisotropy can also be lowered or even switched off during the write process by simply altering the applied voltage to the substrate. Based on these effects, we propose two magnetic data storage protocols, one of which could potentially replace HAMR technology, with both schemes promising unprecedented increases in the data storage areal density beyond the super-paramagnetic size limit. V C 2014 AIP Publishing LLC.

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Strain-mediated elastic coupling in magnetoelectric nickel/barium-titanate heterostructures

Cited by 52 publications

References 32 publications

Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

Magnetization Reversal in Fe/BaTiO₃(110) Heterostructured Multiferroics

Multiferroic composites for magnetic data storage beyond the super-paramagnetic limit

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Strain-mediated elastic coupling in magnetoelectric nickel/barium-titanate heterostructures

Cited by 52 publications

References 32 publications

Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures

Magnetization Reversal in Fe/BaTiO3(110) Heterostructured Multiferroics

Multiferroic composites for magnetic data storage beyond the super-paramagnetic limit

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Product

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Magnetization Reversal in Fe/BaTiO₃(110) Heterostructured Multiferroics