Temperature-dependent exchange bias properties of polycrystalline PtxCo1− x/CoO bilayers

Demirci, E.; Öztürk, Mustafa Kemal; Sınır, Ekrem; Ulucan, Utku; Akdoğan, N.; Öztürk, Osman; Erkovan, Mustafa

doi:10.1016/j.tsf.2013.09.086

Cited by 13 publications

(9 citation statements)

References 53 publications

(71 reference statements)

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“…Figure 3b shows the Co 2p core level with multiple peaks due to the spin orbital splitting and final state features (shake-up satellites) of the 3d 6 and 3d 7 L lines electronic structure for Co 3 + and Co 2 + in different cobalt oxide modification [34]. The Co 2p 3/2 region was fitted with two peaks at 779.7 and 781 eV that were assigned to Co 2+ and Co 3+ oxidation states respectively [35]. The broad and low intensity satellite structure is due to the overlapping of the two satellites, typical for the Co 3 O 4 spinel.…”

Section: Pt-co Nanoparticles Characterizationmentioning

confidence: 99%

Pt-CoOx nanoparticles supported on ETS-10 for preferential oxidation of CO reaction

Lopez

Navascués

Mallada

et al. 2016

Applied Catalysis A: General

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In this paper we prepare bimetallic Pt-CoOx nanoparticles which are further supported in microporous titanosilicate ETS-10. This support has been previously demonstrated as a good candidate for this reaction in the presence of CO 2 and H 2 O. The bimetallic nanoparticles and the supported catalysts containing different loadings of nanoparticles have been extensively characterized and tested in the PROX reaction. The characterization of the nanoparticles discarded the formation of a metallic alloy, although Co and Pt are intimately in contact in the nanoparticle as the HAADF-STEM images revealed. XPS confirmed that the calcined nanoparticles would consist of metallic platinum and cobalt and Pt oxides. The catalyst containing 1.4 wt.% of PtCo nanoparticles can achieve complete CO conversion in the temperature range 120-150ºC working at WHSV=30 L h-1 g-1 .

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Section: Pt-co Nanoparticles Characterizationmentioning

confidence: 99%

Pt-CoOx nanoparticles supported on ETS-10 for preferential oxidation of CO reaction

Lopez

Navascués

Mallada

et al. 2016

Applied Catalysis A: General

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“…From the QCM tion, we estimate a pessimistic upper limit for the stack thickness uncertainty o nm, which is regarded in the stray field uncertainties calculated below (Appendic G). For similar deposition rates and low sputtering powers, the thicknesses are co [39,40].…”

Section: = +mentioning

confidence: 99%

A Ti/Pt/Co Multilayer Stack for Transfer Function Based Magnetic Force Microscopy Calibrations

et al. 2021

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Magnetic force microscopy (MFM) is a widespread technique for imaging magnetic structures with a resolution of some 10 nanometers. MFM can be calibrated to obtain quantitative (qMFM) spatially resolved magnetization data in units of A/m by determining the calibrated point spread function of the instrument, its instrument calibration function (ICF), from a measurement of a well-known reference sample. Beyond quantifying the MFM data, a deconvolution of the MFM image data with the ICF also corrects the smearing caused by the finite width of the MFM tip stray field distribution. However, the quality of the calibration depends critically on the calculability of the magnetization distribution of the reference sample. Here, we discuss a Ti/Pt/Co multilayer stack that shows a stripe domain pattern as a suitable reference material. A precise control of the fabrication process, combined with a characterization of the sample micromagnetic parameters, allows reliable calculation of the sample’s magnetic stray field, proven by a very good agreement between micromagnetic simulations and qMFM measurements. A calibrated qMFM measurement using the Ti/Pt/Co stack as a reference sample is shown and validated, and the application area for quantitative MFM measurements calibrated with the Ti/Pt/Co stack is discussed.

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“…Co and antiferromagnetic (AF) CoO layers, a shift in the hysteresis loop of the FM layer was observed at the temperatures below the Nèel temperature of CoO (∼ 290 K). This shift is called the exchange bias (EB) effect [20,21] and has great importance for data storage and magnetic sensor technologies. These results prove the capability and the sensitivity of the developed probe for the magneto-transport measurements of ultrathin films.…”

Section: Test Measurementsmentioning

confidence: 99%

Design of a multifunctional sample probe for transport measurements

2018

Turk J Phys

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Herein, we describe a multifunctional sample probe equipped with a two-axis goniometer for transport measurements. The two-axis goniometer enables both computer-controlled 360 • out-of-plane and manual 360 • in-plane rotations. The multifunctional sample probe was successfully implemented to a host dewar and an electromagnet system. The developed probe is capable of performing transport measurements while fully controlling the parameters such as the magnetic and electrical fields, the angle, the temperature, and the current/voltage parameters in a wide range. The design of the multifunctional sample probe allows easy installation into different dewar and magnet systems and connection of a wide range of external devices. A software interface based on NI Labview visual programming language was developed to control the system. The setup was tested in the hysteresis loop measurements of perpendicularly magnetized Co/Pt/CoO ultrathin films with the anomalous Hall effect (AHE) method. We also performed temperature-dependent exchange bias measurements on the same ultrathin films where the developed probe revealed much better resolution compared to a standard vibrating sample magnetometry system.

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Temperature-dependent exchange bias properties of polycrystalline PtxCo1− x/CoO bilayers

Cited by 13 publications

References 53 publications

Pt-CoOx nanoparticles supported on ETS-10 for preferential oxidation of CO reaction

Pt-CoOx nanoparticles supported on ETS-10 for preferential oxidation of CO reaction

A Ti/Pt/Co Multilayer Stack for Transfer Function Based Magnetic Force Microscopy Calibrations

Design of a multifunctional sample probe for transport measurements

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