Interfacial ferromagnetism and atomic structures in high-temperature grown Fe3O4/Pt/Fe3O4 epitaxial trilayers

Kikkawa, Takashi; Suzuki, Motohiro; Ramos, R.; Aguirre, Myriam H.; Okabayashi, Jun; Uchida, K.; Lucas, I.; Anadón, Alberto; Kikuchi, Daisuke; Algarabel, P. A.; Morellón, L.; Ibarra, M. R.; Saitoh, Eiji

doi:10.1063/1.5125761

Cited by 14 publications

(7 citation statements)

References 71 publications

(141 reference statements)

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“…17 Furthermore, a strong XMCD signal was observed in Fe 3 O 4 /Pt/Fe 3 O 4 epitaxial trilayers mainly caused by Fe-Pt interdiffusion and Fe-Pt alloying due to the deposition of Pt at high temperature. 26 The difference between the MPE in HM/FMM and HM/FMI structures seems to be consistent with the situation of superconducting thin films on FMM or FMI: the magnetic moment of Cu in YBa 2 Cu 3 O 7 is finite when in proximity to the FMM La 2/3 Ca 1/3 MnO 3 , but below the detection limit on the FMI LaMnO 3 . 27 The presence or absence of MPEs in HM/FMI heterostructures has direct consequences for the understanding of spin current experiments.…”

Section: Introductionsupporting

confidence: 72%

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y$_{3}$Fe$_{5}$O$_{12}$ and inverted Y$_{3}$Fe$_{5}$O$_{12}$/Pt bilayers

Geprägs,

Klewe,

Meyer

et al. 2020

Preprint

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The magnetic state of heavy metal Pt thin films in proximity to the ferrimagnetic insulator Y3Fe5O12 has been investigated systematically by means of x-ray magnetic circular dichroism and xray resonant magnetic reflectivity measurements combined with angle-dependent magnetotransport studies. To reveal intermixing effects as the possible cause for induced magnetic moments in Pt, we compare thin film heterostructures with different order of the layer stacking and different interface properties. For standard Pt layers on Y3Fe5O12 thin films, we do not detect any static magnetic polarization in Pt. These samples show an angle-dependent magnetoresistance behavior, which is consistent with the established spin Hall magnetoresistance. In contrast, for the inverted layer sequence, Y3Fe5O12 thin films grown on Pt layers, Pt displays a finite induced magnetic moment comparable to that of all-metallic Pt/Fe bilayers. This magnetic moment is found to originate from finite intermixing at the Y3Fe5O12/Pt interface. As a consequence, we found a complex angle-dependent magnetoresistance indicating a superposition of the spin Hall and the anisotropic magnetoresistance in these type of samples. Both effects can be disentangled from each other due to their different angle dependence and their characteristic temperature evolution.

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Section: Introductionsupporting

confidence: 72%

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y$_{3}$Fe$_{5}$O$_{12}$ and inverted Y$_{3}$Fe$_{5}$O$_{12}$/Pt bilayers

Geprägs,

Klewe,

Meyer

et al. 2020

Preprint

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“…We can estimate the value of E MP using the model proposed by Guo et al 40 , where they theroretically estimated the ANE in a magnetized Pt as a function of the induced spin magnetic moment (m S ). With their estimation and the value of m S = 0.31 ± 0.04 µ B for Pt recently measured by XMCD in a Fe 3 O 4 /Pt/Fe 3 O 4 trilayer by Kikkawa et al 29 , we obtain the induced ANE electric field as a function of the Pt resistivity (E MP /∇T = 2.5 ρ Pt , where the resistivity prefactor units are Am −1 K −1 ). Now we can analyze the thickness dependence of the ANE using Eq.…”

Section: (A)mentioning

confidence: 59%

“…In the case of YIG/Pt and other insulating ferrimagnetic oxides the MPE has been shown to be negligibly small. [25][26][27][28] However, recent X-ray magnetic circular dichroism (XMCD) measurements in a Fe 3 O 4 /Pt/Fe 3 O 4 trilayer, 29 show a large induced magnetic moment in the Pt interlayer, therefore investigating its effect on the thermally-driven magnetotransport properties 30 is important to gain further insight of the heat-to-electricity conversion process in [Fe 3 O 4 /Pt]-based heterostructures. To this purpose, we have performed measurements of the longitudinal SSE, 31 with an in-plane magnetic field (IM) [Fig.…”

mentioning

confidence: 99%

Interface-induced anomalous Nernst effect in Fe3O4/Pt-based heterostructures

Ramos

Kikkawa

Anadón

et al. 2019

Applied Physics Letters

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Using the values of E MP and t MP previously estimated, we can obtain the dependence of the interface-induced ANE as a function of the number of layers n. Fig. 4 shows the comparison between the ANE measured in the PM configuration for two sets of multilayers with t Pt = 7 and 17 nm and the estimation using Eq. 4. Our model can describe the dependence of the ANE-induced electric field with the number of bilayers (n) and the layer thicknesses, the magnitude of the predicted ANE in the multilayers is slightly smaller than the measured one, specially in the case of thinner samples. The observed magnitude difference could be possibly due to the presence of additional contributions, such as interface-roughness-induced spin-orbit effects in the ferromagnetic layer, 46 which can generate ANE-like voltages as suggested in Ref. 18. In summary, we observed a non-negligible ANE in [Fe 3 O 4 /Pt] n multilayers and investigated its origin by systematic measurements in [Fe 3 O 4 /Pt/Fe 3 O 4 ] trilayers as a function of the Pt thickness. The results can be understood by an interface-induced ANE, with its origin possibly due to a subnanometer Fe-Pt interdiffusion, which possibly affects the Fe coordination and/or the elemental composition at the interface. Measurements of magnetic moment and length-scale of magnetic interface (t MP ) as a function of Pt deposition temperature by other techniques (XMCD, XRMR) can help to further clarify the origin of the observed effect. These results suggest the possibility of tuning the thermoelectric response by thermal 7treatment and that, although the SSE is the dominant mechanism, the interface-induced ANE can positively contribute to the the spin-induced thermopower in multilayer systems.We thank T. Kuschel for fruitful discussions.

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“…The present Ni/Pt superlattices do not follow the relationship between S ANE and Ms mentioned in[Ref.23]. From the viewpoint of practical applications, this large S ANE and small Ms could be promising to improve the thermoelectric conversion performance as discussed in Refs.14, 23 and 27.One may think the following scenarios for explaining the enhanced ANE: (i) alloying of Ni and Pt at the interfaces, (ii) the contribution of proximity-induced magnetic moments in Pt [Refs 28,29].…”

mentioning

confidence: 76%

Enhancement of the anomalous Nernst effect in Ni/Pt superlattices

et al. 2021

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We report an enhancement of the anomalous Nernst effect (ANE) in Ni/Pt (001) epitaxial superlattices.The transport and magneto-thermoelectric properties were investigated for the Ni/Pt superlattices with various Ni layer thicknesses (t). The anomalous Nernst coefficient was increased up to more than 1 µV K -1 for 2.0 nm ≤ t ≤ 4.0 nm, which was the remarkable enhancement compared to the bulk Ni. It has been found that the large transverse Peltier coefficient (axy), reaching axy = 4.8 A K -1 m -1 for t = 4.0 nm, plays a prime role for the enhanced ANE of the Ni/Pt (001) superlattices.

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Interfacial ferromagnetism and atomic structures in high-temperature grown Fe3O4/Pt/Fe3O4 epitaxial trilayers

Cited by 14 publications

References 71 publications

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y$_{3}$Fe$_{5}$O$_{12}$ and inverted Y$_{3}$Fe$_{5}$O$_{12}$/Pt bilayers

Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y$_{3}$Fe$_{5}$O$_{12}$ and inverted Y$_{3}$Fe$_{5}$O$_{12}$/Pt bilayers

Interface-induced anomalous Nernst effect in Fe3O4/Pt-based heterostructures

Enhancement of the anomalous Nernst effect in Ni/Pt superlattices

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