Tuning the Curie temperature of <i>L</i>1 ordered FePt thin films through site-specific substitution of Rh

Xu, D. B.; Sun, Chengjun; Chen, Jingsheng; Zhou, Tiejun; Heald, Steve M.; Bergman, Anders; Sanyal, Biplab; Chow, Gan Moog

doi:10.1063/1.4897450

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…The saturation Hall resistance is influenced by both saturation magnetization (M s ) and longitudinal resistance (R xx ) as mentioned in the introduction. Since the Curie temperature of L1 0 -FePt is higher than 700 K [25,26] and the change in M s with the temperature is less than 10% at temperature range below 300 K [12,27], the dominating factor governing the decrease of saturation Hall resistance can be attributed to the significant decrease in R xx .…”

Section: Resultsmentioning

confidence: 99%

Thickness dependence of anomalous Hall conductivity in L1₀-FePt thin film

Yu¹,

González‐Hernández²,

Liu³

et al. 2019

J. Phys. D: Appl. Phys.

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L1 0 ordered alloys are ideal models for studying the anomalous Hall effect (AHE), which can be used to distinguish the origin from intrinsic (from band structure) or from extrinsic effects (from impurity scatterings). In the bulk limit of L1 0 ordered FePt films, the AHE is considered to be dominated by the intrinsic contribution, which mainly comes from the strong spin-orbit interaction (SOI) of Pt atoms and exchange-splitting of Fe atoms. The study of anomalous Hall conductivity (AHC) of L1 0 -FePt thin films is of particular interest for its application in spintronic devices. In order to reduce the effects of defects such as grain boundaries, we chose SrTiO 3 as the substrate, which has a very small mismatch (0.1%) with L1 0 -FePt films to obtain high quality continuous thin films. We show that the contribution from phonon scattering should be included to fully interpret the AHE signals. For our 6 nm FePt film, the AHE mainly originates from the contribution of phonon scattering. While for the thicker films, the origin for AHE is mainly intrinsic Berry curvature contribution. Both experimental results and calculation results show that AHC increases with thickness and reaches the saturation when the film thickness approaches a critical value.

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Section: Resultsmentioning

confidence: 99%

Thickness dependence of anomalous Hall conductivity in L1₀-FePt thin film

Yu¹,

González‐Hernández²,

Liu³

et al. 2019

J. Phys. D: Appl. Phys.

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“…If the spacer layer is thin (<2 nm), heat and spin loss by diffusion will be negligible. For the case presented herein, a single FePt layer is examined, where the magnetic domains can be made using interspersed alloyed regions, such as FeCoPt and FePtRh, or tailored FePt nanoparticle arrays − that alter the magnetic properties of the films while minimally affecting the thermal performance. Therefore, we use typical thermal and optical parameters for FePt films while using Seebeck coefficients on the order 10 1 –10 2 μV/K (as for NiMnGa) .…”

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confidence: 99%

Shaping and Storing Magnetic Data Using Pulsed Plasmonic Nanoheating and Spin-Transfer Torque

et al. 2019

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Spin transfer techniques have in recent years become attractive as an alternative to electronic-based devices for use in a wide range of magnetic devices such as spin valves for magnetic sensing, tunnel junctions and random access memories (MRAM; see the following refs: Chappert, C.; Fert, A.; Nguyen Van Dau, F. The emergence of spin electronics in data storage. Nat. Mater. 2007, 6, 813–823; Prejbeanu, I. L.; Kerekes, M.; Sousa, R. C.; Sibuet, H; Redon, O.; Dieny, B.; Nozières, J. P. Thermally assisted MRAM. J. Phys. Condens. Matter 2007, 19, 165218; Jain, S., Ranjan, A.; Roy, K.; Raghunathan, A. Computing in memory with spin-transfer torque magnetic RAM. IEEE Transactions on Very Large Scale Integration (VLSI) Systems 2018, 26, 470–483). Much effort has been placed on pursuing ultrathin media, which are not only ferromagnetic, but demonstrate a large spin-dependent Seebeck effect (SDSE) capable of generating the required spin currents for efficient nanoscale operation of these devices (see the following refs: Xiao, J. In Spintronics for Next Generation Innovative Devices; Katsuaki, S., Saitoh E., Eds.; Wiley: New York, 2015; pp 125–140; Ghiasi, T. S.; Ingla-Aynés, J.; Kaverzin, A. A; van Wees, B. J. Large proximity-induced spin lifetime anisotropy in transition-metal dichalcogenide/graphene heterostructures. Nano Lett. 2017, 17, 7528–7532; Comtesse, D.; Geisler, B.; Entel, P.; Kratzer, P.; Szunyogh, L. First-principles study of spin-dependent thermoelectric properties of half-metallic Heusler thin films between platinum leads. Phys. Rev. B 2014, 89, 094410). By generating very large temperature gradients on the order of 10 K/nm, the SDSE can produce a spin current that transfers the spin polarization of a magnetic domain (MD) along the gradient (∝ heat current). As spin accumulates in an adjacent domain, it is in turn able to induce a torque on its magnetic moments (see Choi, G-M.; Min, B-C.; Lee, K-J.; Cahill, D.G. Spin current generated by thermally driven ultrafast demagnetization. Nat. Commun. 2014, 5, 4334). As improvements in magnetic materials continue, we show by assuming reasonable enhancements of SDSE that a plasmonic near-field transducer (NFT) is able to create the very high temperature gradients in order to manipulate spin states in the heated region. This advancement allows the spin polarization to be adjusted without going above the material’s Curie limit. It also allows the spin-transfer torque (STT) to be applied over areas as small as a few tens of nm2 within the film, thus being able to write magnetic data more precisely without affecting the alignment of other nearby domains. This is crucial in order to have a high-fidelity and high-density bit writing process on the nanoscale. Herein we demonstrate via numerical analysis the ability to control the time dynamics of STT, which range from the ultrafast (pico) to the nanosecond regime, using only the heat currents produced by the NFT. This enables direct control over the alignment of the magnetization within the domains using plasmonic nanohea...

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Extending the Pre-ordered Precursor Reduction strategy to L10 ternary alloys: the case of MnFePt

Capobianchi,

Imperatori,

Cannas

et al. 2024

Journal of Alloys and Compounds

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Tuning the Curie temperature of L1 ordered FePt thin films through site-specific substitution of Rh

Cited by 8 publications

References 25 publications

Thickness dependence of anomalous Hall conductivity in L1₀-FePt thin film

Thickness dependence of anomalous Hall conductivity in L1₀-FePt thin film

Shaping and Storing Magnetic Data Using Pulsed Plasmonic Nanoheating and Spin-Transfer Torque

Extending the Pre-ordered Precursor Reduction strategy to L10 ternary alloys: the case of MnFePt

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Tuning the Curie temperature of L1 ordered FePt thin films through site-specific substitution of Rh

Cited by 8 publications

References 25 publications

Thickness dependence of anomalous Hall conductivity in L10-FePt thin film

Thickness dependence of anomalous Hall conductivity in L10-FePt thin film

Shaping and Storing Magnetic Data Using Pulsed Plasmonic Nanoheating and Spin-Transfer Torque

Extending the Pre-ordered Precursor Reduction strategy to L10 ternary alloys: the case of MnFePt

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Thickness dependence of anomalous Hall conductivity in L1₀-FePt thin film

Thickness dependence of anomalous Hall conductivity in L1₀-FePt thin film