Inhomogeneous ferromagnetism mimics signatures of the topological Hall effect in 
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 films

Kim, Gideok; Son, Kwanghyo; Suyolcu, Y. Eren; Miao, Ludi; Schreiber, Nathaniel J.; Nair, Hari P.; Putzky, Daniel; Minola, M.; Christiani, G.; Aken, Peter A. van; Shen, Kyle; Schlom, Darrell G.; Логвенов, Г.; Keimer, B.

doi:10.1103/physrevmaterials.4.104410

Cited by 34 publications

(30 citation statements)

References 41 publications

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“…The difference was 9.3% for the Sr spectra and 31.5% for the Ru spectra, indicating many Ru deficiencies in the SRO film when a low P (O 2 ) LAO was used. Note that Ru deficiencies in SRO degrade itinerant ferromagnetism, [ 33,41,42 ] causing AHE sign reversal. [ 21 ] We found that Ru deficiencies introduced during LAO layer formation caused nanoscale structural deformations of the SRO layer, decreased T C , and rendered ρ AHE positive.…”

Section: Resultsmentioning

confidence: 99%

“…However, the high sensitivity of SRO to external parameters has also given rise to significant concerns about inhomogeneity‐induced artifacts in the AHEs. [ 27–36 ] If significant inhomogeneities are present, spatial regions that are magnetized differently contribute to the AHE signal. Particularly, if two types of region with opposite AHE signs are present, the field‐dependent Hall signal can mimic the “hump anomaly,” similar to that of the topological Hall effect (THE).…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, if two types of region with opposite AHE signs are present, the field‐dependent Hall signal can mimic the “hump anomaly,” similar to that of the topological Hall effect (THE). [ 12,13,37,38 ] Such a two‐channel AHE can be induced by inhomogeneous film thickness, [ 30,31 ] structural variation, [ 32 ] Ru vacancies, [ 33 ] and interfacial effects. [ 34,35 ] More recently, the ion irradiation has been used for post‐synthesis control of AHE.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Two‐Channel Magnetotransport in SrRuO₃ Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Lee

et al. 2021

Adv Elect Materials

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In the field of oxide heterostructure engineering, there are extensive efforts to couple the various functionalities of each material. The Berry curvature‐driven magnetotransport of SrRuO3 ultrathin films is currently receiving a great deal of attention because it is extremely sensitive to the electronic structures near the Fermi surface driven by extensive physical parameters such as spin–orbit coupling and inversion symmetry breaking. Although this is beneficial in terms of heterostructure engineering, it renders transport behavior vulnerable to nanoscale inhomogeneity, resulting in artifacts called “hump anomalies.” Here, a method to tune the magnetotransport properties of SrRuO3 ultrathin films capped by LaAlO3 layers is developed. The kinetic process of pulsed laser deposition by varying the growth pressure during LaAlO3 layer deposition is systematically controlled. Furthermore, the effects of nanoscale inhomogeneity on the Berry curvature near the Fermi surface in SrRuO3 films are investigated. It is found that the high kinetic energy of the capping layer adatoms induces stoichiometric modification and nanoscale lattice deformation of the underlying SrRuO3 layer. The control of kinetics provides a way to modulate magnetization and the associated magnetotransport of the SrRuO3 layer.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tunable Two‐Channel Magnetotransport in SrRuO₃ Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Lee

et al. 2021

Adv Elect Materials

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“…In this case, the observed bump/dip kind of signature in Hall resistivity can be readdressed in the shades of multichannel transport. More rigorously speaking, overlapping of AHE with opposite sign (one with +ve and another with -ve) can produce a signal similar to THE [46][47][48][49][50][51]. In such cases, the opposite polarity of AHE with different coercive fields (H c ) and/or magnetization (M) occurs as a result of magnetic inhomogeneity.…”

Section: Transport Propertiesmentioning

confidence: 99%

Intra-unitcell cluster-cluster magnetic compensation and large exchange bias in cubic alloys

Giri,

Sahni,

Mejía

et al. 2021

Preprint

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Composite quantum materials are the ideal examples of multifunctional systems which simultaneously host more than one novel quantum phenomenon in physics. Here, we present a combined theoretical and experimental study to demonstrate the presence of an extremely large exchange bias in the range 0.8 T-2.7 T and a fully compensated magnetic state (FCF) in a special type of Pt and Ni doped Mn3In cubic alloy. Here, oppositely aligned uncompensated moments in two different atomic clusters sum up to zero which are responsible for the FCF state. Our dDensity functional theory (DFT) calculations show the existence of several possible ferrimagnetic configurations with the FCF as the energetically most stable one. The microscopic origin of the large exchange bias can be interpreted in terms of the exchange interaction between the FCF background and the uncompensated ferrimagnetic clusters stabilized due to its negligible energy difference with respect to the FCF phase. We utilize pulsed magnetic field up to 60 T and 30 T static field magnetization measurements to confirm the intrinsic nature of exchange bias in our system. Finally, our Hall effect measurements demonstrate the importance of uncompensated noncoplanar interfacial moments for the realization of large EB. The present finding of gigantic exchange bias in a unique compensated ferrimagnetic system opens up a direction for the design of novel quantum phenomena for the technological applications.

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“…In addition to charge transport, the real-space Berry phase also affects heat flow through topological Nernst [29,30] and thermal Hall effects [31]. However, there is growing evidence of examples in thin films where the ostensible appearance of THE may in fact be an additional Hall effect contribution stemming from inhomogeneous magnetic domains and domain wall scattering [32][33][34][35][36][37][38]. Hence, one generally needs complementary imaging probes to confirm the existence of skyrmions.…”

Section: Introductionmentioning

confidence: 99%

Resonant optical topological Hall conductivity from skyrmions

Sorn,

Yang,

Paramekanti

2021

Preprint

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We study the high frequency Hall conductivity in a two-dimensional (2D) model of conduction electrons coupled to a background magnetic skyrmion texture via an effective Hund's coupling term. For an ordered skyrmion crystal, a Kubo formula calculation using the basis of skyrmion crystal Chern bands reveals a resonant Hall response at a frequency set by the Hund's coupling: ωres ≈ JH . A complementary real-space Kubo formula calculation for an isolated skyrmion in a box reveals a similar resonant Hall response. A linear relation between the area under the Hall resonant curve and the skyrmion density is discovered numerically and is further elucidated using a gradient expansion which is valid for smooth textures and a local approximation based on a spin-trimer calculation. We point out the issue of distinguishing this skyrmion contribution from a similar feature arising from spin-orbit interactions, as demonstrated in a model for Rashba spin-orbit coupled electrons in a collinear ferromagnet, which is analogous to the difficulty of unambiguously separating the d.c. topological Hall effect from the anomalous Hall effect. The resonant feature in the high frequency topological Hall effect is proposed to provide a potentially useful local optical signature of skyrmions via probes such as scanning magneto-optical Kerr microscopy.

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Inhomogeneous ferromagnetism mimics signatures of the topological Hall effect in SrRuO3 films

Cited by 34 publications

References 41 publications

Tunable Two‐Channel Magnetotransport in SrRuO₃ Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Tunable Two‐Channel Magnetotransport in SrRuO₃ Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Intra-unitcell cluster-cluster magnetic compensation and large exchange bias in cubic alloys

Resonant optical topological Hall conductivity from skyrmions

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Inhomogeneous ferromagnetism mimics signatures of the topological Hall effect in SrRuO3 films

Cited by 34 publications

References 41 publications

Tunable Two‐Channel Magnetotransport in SrRuO3 Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Tunable Two‐Channel Magnetotransport in SrRuO3 Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Intra-unitcell cluster-cluster magnetic compensation and large exchange bias in cubic alloys

Resonant optical topological Hall conductivity from skyrmions

Contact Info

Product

Resources

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Tunable Two‐Channel Magnetotransport in SrRuO₃ Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition

Tunable Two‐Channel Magnetotransport in SrRuO₃ Ultrathin Films Achieved by Controlling the Kinetics of Heterostructure Deposition