SQUID magnetometry combined with in situ cyclic voltammetry: A case study of tunable magnetism of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0007.gif" overflow="scroll"><mml:mi>γ</mml:mi></mml:math>-Fe2O3 nanoparticles

Topolovec, Stefan; Jerabek, Peter; Szabó, Dorothée Vinga; Krenn, H.; Würschum, Roland

doi:10.1016/j.jmmm.2012.09.071

Cited by 16 publications

(5 citation statements)

References 19 publications

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“…SQUID magnetometry was performed in a MPMS-XL-7 device (Quantum Design) at a constant magnetic field of 5 kOe upon in situ electrochemical charging with an Autolab PGSTAT128N potentiostat (Metrohm). The magnetic measurements were performed in a miniaturized electrochemical cell by using porous carbon fabric and a gold wire as counter and quasi-reference electrode, respectively, similar to our setup presented recently [12]. In the present improved setup a long borosilicate glass NMR tube (Wilmad-LabGlass, length 17.78 cm, diameter 4.96 mm) was used as the electrolyte container.…”

Section: Methodsmentioning

confidence: 99%

“…These different electronic properties represent an ideal combination to provide a deeper understanding of the underlying charge-related processes since both properties are expected to respond differently on charging and chemical modification. The studies make use of a specifically designed electrochemical cell that allows in situ magnetic studies in a SQUID magnetometer under electrochemical control [12]. …”

Section: Introductionmentioning

confidence: 99%

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In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation

Steyskal¹,

Topolovec²,

Landgraf³

et al. 2013

Beilstein J. Nanotechnol.

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SummaryControlled tuning of material properties by external stimuli represents one of the major topics of current research in the field of functional materials. Electrochemically induced property tuning has recently emerged as a promising pathway in this direction making use of nanophase materials with a high fraction of electrode-electrolyte interfaces. The present letter reports on electrochemical property tuning of porous nanocrystalline Pt. Deeper insight into the underlying processes could be gained by means of a direct comparison of the charge-induced response of two different properties, namely electrical resistance and magnetic moment. For this purpose, four-point resistance measurements and SQUID magnetometry were performed under identical in situ electrochemical control focussing on the regime of electrooxidation. Fully reversible variations of the electrical resistance and the magnetic moment of 6% and 1% were observed upon the formation or dissolution of a subatomic chemisorbed oxygen surface layer, respectively. The increase of the resistance, which is directly correlated to the amount of deposited oxygen, is considered to be primarily caused by charge-carrier scattering processes at the metal–electrolyte interfaces. In comparison, the decrease of the magnetic moment upon positive charging appears to be governed by the electric field at the nanocrystallite–electrolyte interfaces due to spin–orbit coupling.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation

Steyskal¹,

Topolovec²,

Landgraf³

et al. 2013

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

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“…Magnetometry can detect magnetization variations of cathodes to obtain valuable information about the electrochemical mechanism. [ 172,173 ]…”

Section: Magnetometrymentioning

confidence: 99%

“…Magnetometry can detect magnetization variations of cathodes to obtain valuable information about the electrochemical mechanism. [172,173] Li x Ni 1/3 Mn 1/3 Co 1/3 O 2 : Although several ex situ magnetometry application to Li x Ni 1/3 Mn 1/3 Co 1/3 O 2 electrodes have been reported, the charge-compensation process during delithiation/lithiation remains unclear. [150,152,174,175] Klinser et al performed operando monitoring 𝜒 of a Li x Ni 1/3 Mn 1/3 Co 1/3 O 2 cathode to clarify the charge compensation process.…”

Section: Cathodementioning

confidence: 99%

Magnetic Measurements Applied to Energy Storage

Zhang

Liu

et al. 2023

Advanced Energy Materials

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How to increase energy storage capability is one of the fundamental questions, it requires a deep understanding of the electronic structure, redox processes, and structural evolution of electrode materials. These thorny problems now usually involve spin-orbit, spin-related electron configuration, etc., which cannot be probed using conventional testing techniques. Considering the intimate connection between spin and magnetic properties, using electron spin as a probe, magnetic measurements make it possible to analyze energy storage processes from the perspective of spin and magnetism. Owing to the capability of characterizing spin properties and high compatibility with the energy storage field, magnetic measurements are proven to be powerful tools for contributing to the progress of energy storage. In this review, several typical applications of magnetic measurements in alkali metal ion batteries research to emphasize the intimate connection between the magnetic properties and electronic structure, which is associated with the electrochemical performance of the electrode materials, are presented. Finally, the current challenges of magnetic measurements and the prospects for enhanced analysis of energy storage systems are discussed.

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“…The extension of electrochemically controlled magnetism towards bulk has already been achieved via liquid electrolyte gating and Li intercalation for metal organic frameworks [20] and various porous or nanosized metal oxides [21][22][23]. These materials, however, cannot compete with ferromagnetic metals in terms of magnetization values.…”

Section: Introductionmentioning

confidence: 99%

Voltage-controlled ON switching and manipulation of magnetization via the redox transformation of β-FeOOH nanoplatelets

Nichterwitz

Neitsch

Röher

et al. 2019

J. Phys. D: Appl. Phys.

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Redox-based metal/metal oxide transformations achieved via electrolytic gating recently emerged as a novel, magneto-ionic route for voltage control of magnetism. So far, mainly metal or oxide thin films and nanoporous metal alloy structures are used as starting materials. The present study demonstrates a magneto-ionic transformation starting from a stable electrodeposited FeOOH nanoplatelet structure. The application of a low voltage in a Li-based electrolyte results in the reduction of the virtually non-magnetic FeOOH into ferromagnetic Fe, yielding an ON switching of magnetization. The magnetization can be tuned in a large range by the time of voltage application and remains stable after voltage-switch off. A reversible magneto-ionic change of magnetization of up to 15% is achieved in the resulting iron films with a thickness of about 30 nm. This large magneto-ionic effect is attributed to the enhanced roughness of the iron films obtained from the nanoplatelet structure. The robust, voltage-controlled, and non-volatile ON switching of magnetism starting from a stable oxide structure is promising for the development of energy-efficient magnetic switches, magnetic actuation and may offer new avenues in magnetoelectronic devices.

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SQUID magnetometry combined with in situ cyclic voltammetry: A case study of tunable magnetism of γ-Fe2O3 nanoparticles

Cited by 16 publications

References 19 publications

In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation

In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation

Magnetic Measurements Applied to Energy Storage

Voltage-controlled ON switching and manipulation of magnetization via the redox transformation of β-FeOOH nanoplatelets

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