A Vibrating Reed Magnetometer for Microscopic Particles

Zijlstra, H.

doi:10.1063/1.1684777

Cited by 73 publications

(15 citation statements)

References 8 publications

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“…With the introduction of the 'Alternating Gradient Force Magnetometer' (Zijlstra 1970;Flanders 1988) an instrument combining high sensitivity and high speed of measurement became available; this allows us to study large and weakly magnetic sample series without prior enrichment. High-resolution hysteresis loops and back-field curves up to 1.4 or 2 T can be registered within a few minutes.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…During the remagnetization of individual grains, the two sorts of processes typically alternate (Stoner & Wohlfarth 1948;Williams & Dunlop 1995). This leads to characteristic 'slope' and 'jump' sections in single-particle hysteresis loops (Zijlstra 1970). A rock sample is an assemblage of many ferro-(or ferri-) magnetic particles, and the numerous individual Barkhausen jumps in the course of its saturation hysteresis loop cannot be experimentally resolved.…”

Section: Induced and Remanent Hysteresis Componentsmentioning

confidence: 99%

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A systematic analysis of natural magnetic mineral assemblages based on modelling hysteresis loops with coercivity-related hyperbolic basis functions

Dobeneck

1996

Geophysical Journal International

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The new rock-magnetic method presented here is a series of successive procedures, by which experimental hysteresis and back-field magnetization data are ultimately converted into 'hyperbolic spectra'. The processing comprises smoothing and centring of raw data, asymptotic slope correction, determination of common hysteresis parameters and modelling of induced and remanent hysteresis components with specially adapted hyperbolic basis functions. The resulting spectral diagrams denote the relative contributions of 10-40 coercivity classes, each representing ferromagnetic particles of a narrow, clearly defined coercivity range. The distribution patterns of these spectra allow the discrimination and quantification of discrete mineral or grain-size fractions and the calculation of their partial hysteresis loops. A computer program ('HYSTEAR') for interactive and automated hysteresis loop data processing applying the algorithms described is available from the author.

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Section: Data Acquisitionmentioning

confidence: 99%

Section: Induced and Remanent Hysteresis Componentsmentioning

confidence: 99%

A systematic analysis of natural magnetic mineral assemblages based on modelling hysteresis loops with coercivity-related hyperbolic basis functions

Dobeneck

1996

Geophysical Journal International

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“…O sistema AGFM, 7-10 na sua versão original, é um instrumento sensível e apropriado para a realização de medidas de magnetização e de momento magnético de amostras micro 7,8 e nanométricas em CNTP. Seu funcionamento baseia-se na força magnética (F M ) que um determinado material com momento magnético (m) sofre quando submetido a um gradiente de campo magnético .…”

Section: Parte Experimentalunclassified

“…Por outro lado, a caracterização magnética de materiais nanoestruturados, seja na forma de nanocamadas ou nanopartículas, nos quais a quantidade de material magnético é exígua, exige a utilização de instrumentos de alta sensibilidade para a medição do momento magnético dos mesmos. Um instrumento que tem a sensibilidade adequada é o Magnetômetro de Gradiente de Força Magnética (AGFM), [7][8][9][10] utilizado neste trabalho.…”

Section: Introductionunclassified

Magnetometria in-Situ Para Caracterização De Materiais Eletrodepositados

Franco

Schmidt

2019

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Recebido em 24/12/2018; aceito em 24/04/2019; publicado na web em 14/05/2019 IN-SITU MAGNETOMETRY FOR ELECTRODEPOSITED MATERIALS CHACTERIZATION. We have recently made studies of electrodeposits of Co onto graphene attached to different substrates, successfully performed via in-situ magnetization measurements. The magnetic analysis of deposits as a function of time lapse, indicate that Co grows with different magnetic characteristics from the beginning to the end of each run, independent of the substrate over which the graphene has been deposited on. In this technical note, we use these results and some obtained in several previous researches developed in our laboratory during the last 20 years, to show that the association of in-situ magnetometry with electrodeposition processes can be a powerful tool to understand the dynamics of the electrochemistry involved, as well as the physics of the magnetic materials fabricated. The Electrochemical Alternating Gradient Force Magnetometer (EC-AGFM) is appropriate for: (i) studying the magnetic properties of the electrodeposits either during deposition or dissolution; (ii) evaluating the electrodeposition dynamics via the sample's magnetic response; (iii) scrutiny of the electrodeposits as they undergo chemical changes (oxidation, etc.); (iv) studying the deposited materials from the atomic level up to bulk; v) studying the effects of addition of trace amounts of anions in the solution and their impact on the magnetic properties of metal adatoms.

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“…K for all compounds was determined from meaaurements of magnetisation 1 curves (8) of individual monocrystalline particles of 30 to 50 ym size with the help of a magnetometer (9) in fields up to 15 kOe. The type of magnetic anisotropy for different x was determined both from magnetic measurements and by X-ray methods (10).…”

Section: L-x Xmentioning

confidence: 99%