Magnetoresistance and Anomalous Hall Effect with Pt Spacer Thickness in the Spin-Valve Co/Pt/[Co/Pt]2 Multilayers

Zhang, Fang; Liu, Zhongyuan; Wen, Fusheng; Liu, Qiu-Xiang; Li, Xuecong; Ming, Xianbing

doi:10.1007/s10948-016-3820-8

Cited by 11 publications

(6 citation statements)

References 27 publications

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“…45 We obtain α xy = 2.5 A/(K·m), relatively far from the computed value for the 2Co/5Pt heterostructure (1.2 A/(K·m)), whose layer thicknesses are the closest to the experimental ones among those calculated. More importantly, the ANE contribution to the experimental thermoelectric conductivity dominates over that of the AHE (the former is more than 2 times larger than the latter) and can be expected to dominate at other Pt thicknesses (note that the ρ xy has been shown to vary only modestly with Pt thickness 46 ). Since the measured ANE thermopowers vary only mildly with Pt thickness, we anticipate that the experimental thermoelectric conductivities will also vary only slightly with Pt thicknesses.…”

Section: Resultsmentioning

confidence: 99%

High-Power-Density Energy-Harvesting Devices Based on the Anomalous Nernst Effect of Co/Pt Magnetic Multilayers

López-Polín

Aramberri

Marqués-Marchán

et al. 2022

ACS Appl. Energy Mater.

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The anomalous Nernst effect (ANE) is a thermomagnetic phenomenon with potential applications in thermal energy harvesting. While many recent works studied the approaches to increase the ANE coefficient of materials, relatively little effort was devoted to increasing the power supplied by the effect. Here, we demonstrate a nanofabricated device with record power density generated by the ANE. To accomplish this, we fabricate micrometer-sized devices in which the thermal gradient is 3 orders of magnitude higher than conventional macroscopic devices. In addition, we use Co/Pt multilayers, a system characterized by a high ANE thermopower (∼1 μV/K), low electrical resistivity, and perpendicular magnetic anisotropy. These innovations allow us to obtain power densities of around 13 ± 2 W/cm 3 . We believe that this design may find uses in harvesting wasted energy, e.g., in electronic devices.

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Section: Resultsmentioning

confidence: 99%

High-Power-Density Energy-Harvesting Devices Based on the Anomalous Nernst Effect of Co/Pt Magnetic Multilayers

López-Polín

Aramberri

Marqués-Marchán

et al. 2022

ACS Appl. Energy Mater.

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“…This is probably because the mean free path of the Co layer is sensitive to the temperature and so the spin-dependent scattering changes . The increase in MR with decreasing temperature is attributed to the reduced interchannel spin mixing due to the vibration or collision of magnetrons and phonons . The absence of microelectronic processing results in the small MR of Co/Cu/γ′-Fe 4 N flexible SPVs.…”

Section: Resultsmentioning

confidence: 99%

“…58 The increase in MR with decreasing temperature is attributed to the reduced interchannel spin mixing due to the vibration or collision of magnetrons and phonons. 59 The absence of microelectronic processing results in the small MR of Co/Cu/γ′-Fe 4 N flexible SPVs. In fact, the reasons for a small MR are complicated, such as the current-in-plane measurement geometry, crystallographic quality, surface roughness, the presence of pinholes, interdiffusion between spin channels, and non-spin-dependent scattering.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Manipulation of Magnetic Properties and Magnetoresistance in Co/Cu/γ′-Fe₄N/Mica Flexible Spin Valves via External Mechanical Strains

Chen

Shi

Zhang

et al. 2022

ACS Appl. Electron. Mater.

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The strain-tailored magnetic and electronic transport properties in flexible spin valves (SPVs) have attracted attention due to their practical applications in flexible spintronic devices. Here, magnetic and spin-dependent electronic transport properties of Co/Cu/γ′-Fe4N/mica flexible SPVs are investigated. The strain-induced change ratio of magnetoresistance (MR) is 49% in Co(4.8 nm)/Cu(7.5 nm)/γ′-Fe4N(11.0 nm) flexible SPVs. The magnetic properties of Co(4.8 nm)/Cu(7.5 nm)/γ′-Fe4N(7.9 nm) flexible SPVs show mechanical stability at bending strains. The magnetic properties of flexible SPVs did not deteriorate after 100 times of bending and 60 h of bending. As the Co layer thickness decreases from 7.2 to 2.4 nm, the sign of MR changes from negative to positive. A negative MR appears due to the opposite scattering spin asymmetry coefficients between Co/Cu and γ′-Fe4N/Cu interfaces. A positive MR arises from the same scattering spin asymmetry coefficients at Co/Cu and γ′-Fe4N/Cu interfaces or magnetization misalignments between Co and γ′-Fe4N layers. Additionally, the MR is a combination of an anisotropy magnetoresistance and a giant magnetoresistance effect, which has been confirmed by MR–H curves with different measurement configurations (H in‑plane∥I, H in‑plane⊥I and H out‑of‑plane⊥I) and M–H curves. The M–H curves show that the magnetization of γ′-Fe4N reverses before that of the Co layer.

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“…Ultrathin magnetic films and heterostructures possessing perpendicular magnetic anisotropy (PMA) are promising objects for both fundamental studies (formation and evolution of specific domain structure [1][2][3][4][5], thermoactivated domain wall creep [6], Spin Transport [7,8], anomalous Hall effect [7,9], spin pumping [8], and spin-wave dynamics [10]) and applications (high-density magnetic memory devices [11,12], magnetic sensors for medicine [13], and superfast elements for spintronics [14]). The intensive study of magnetic heterostructure properties [1][2][3][4][5][6][7][8][9][10] is aimed at mechanisms of their magnetization reversal and magnetic transport. The goal is to build adequate theoretical models necessary for the design and optimization of magnetic devices [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure

et al. 2023

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Domain wall mobility as a function of nonmagnetic interlayer thickness and temperature was studied in ultrathin exchange-coupled ferromagnetic layers using magneto-optic Kerr microscopy. The system under study is a Pt/Co/Pt/Co/Pt heterostructure having perpendicular magnetic anisotropy and a middle Pt layer with spatially variable thickness. The ferromagnetic interaction between the Co layers is observed when the Pt interlayer thickness varies from 5 to 6 nm in a temperature range of 200–300 K. There is a certain interval of Pt layer thickness where domain walls in both ferromagnetic layers move independently. Nonlinear dependence of the domain wall displacement on the applied field was measured. It is shown that an equilibrium position of the relaxed domain wall depends on field, temperature, and the nonmagnetic interlayer thickness. This position is determined by the energy balance: (i) domain wall displacement provided by the applied field, (ii) interlayer exchange interaction in the area swept by the domain wall, and (iii) domain wall coercivity. The mechanism of domain wall stabilization in terms of independent wall motion near critical thickness was considered. It is found that both the coercivity of the Co layer and the critical thickness decrease at higher temperature, while the interlayer exchange constant J is changed weakly.

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Magnetoresistance and Anomalous Hall Effect with Pt Spacer Thickness in the Spin-Valve Co/Pt/[Co/Pt]2 Multilayers

Cited by 11 publications

References 27 publications

High-Power-Density Energy-Harvesting Devices Based on the Anomalous Nernst Effect of Co/Pt Magnetic Multilayers

High-Power-Density Energy-Harvesting Devices Based on the Anomalous Nernst Effect of Co/Pt Magnetic Multilayers

Manipulation of Magnetic Properties and Magnetoresistance in Co/Cu/γ′-Fe₄N/Mica Flexible Spin Valves via External Mechanical Strains

Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure

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Magnetoresistance and Anomalous Hall Effect with Pt Spacer Thickness in the Spin-Valve Co/Pt/[Co/Pt]2 Multilayers

Cited by 11 publications

References 27 publications

High-Power-Density Energy-Harvesting Devices Based on the Anomalous Nernst Effect of Co/Pt Magnetic Multilayers

High-Power-Density Energy-Harvesting Devices Based on the Anomalous Nernst Effect of Co/Pt Magnetic Multilayers

Manipulation of Magnetic Properties and Magnetoresistance in Co/Cu/γ′-Fe4N/Mica Flexible Spin Valves via External Mechanical Strains

Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure

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Manipulation of Magnetic Properties and Magnetoresistance in Co/Cu/γ′-Fe₄N/Mica Flexible Spin Valves via External Mechanical Strains