PDF | On Sep 24, 2005, L. L. Afremov and others published Magnetic properties of single-domain particles and the rock remanence | Find, read and cite all the research you …
SUMMARY A recent paper (Dearing et al. 1996) on the use of frequency dependence of magnetic susceptibility (xfd) in magnetic grain-size investigations of environmental materials has proposed a fundamentally new model for the magnetic susceptibility of singledomain (SD) grains measured at different frequencies, and is …
The magnetic hysteresis properties for well-defined micron-sized magnetite samples produced by electron beam lithography (EBL) are presented. In addition to measuring standard hysteresis parameters, first-order reversal curve (FORC) diagrams are also reported. EBL produces samples that consist of particles with very tightly …
Magnetic grain-size and coercivity distributions of a superparamagnetic (SP) particle ensemble together determine its frequency dependence of susceptibility (FDS).
For pt.I see ibid., vol.5, p.2779-92 (1993). A comprehensive study of the remanence curve properties of an assembly of noninteracting single-domain particles with cubic magnetocrystalline anisotropy has been performed. The theoretical calculations presented represent an extension of the zero-temperature analysis of Joffe and …
Diagenetic effects on the magnetic mineralogy in marine sediments have long been investigated, including oxidation/reduction reactions, magnetic dilution, formation of iron sulfides and oxides, magnetization acquisition mechanisms and reliability of the paleomagnetic record. This study investigates diagenetic effects in low-oxygen …
Under typical CO 2 -rich culture conditions, GS-15 is known to produce superparamagnetic magnetite (crystal diameters of approximately <30 nm). In the current study, we were able to produce a unique form of tabular, single-domain magnetite under nontraditional (low-CO 2) culture conditions. This magnetite has a distinct crystal habit …
In this paper, we analyze the method of random exchange interaction fields in combination with the Bette–Peierls approach and explore the possibility of its application to studying the magnetic properties of the rocks. In particular, we discuss the concentration magnetic phase transitions and, as an example, we study the concentration dependences of the …
A similar mechanism may operate in our system leading to the formation of free magnetite particles. The coprecipitation of tabular and diamond shaped magnetite as free particles under the same environmental conditions cannot be explained, however, on the basis of the same kinetic and thermodynamic laws that are applied to inorganic …
This study investigates pressure effects on the magnetic properties of non-interacting single-domain (SD) magnetite. Using a high-pressure cell specially designed for a Magnetic Property Measurement System, magnetic hysteresis measurements were conducted under high pressures of up to 1 GPa on natural plagioclase crystals …
This approach eliminates the effect of dilution of the magnetic properties by weakly magnetic matter, and allows the calculation of direct concentrations (or fluxes for dated sedimentary profiles) of constituent ferrimagnetic components.
Interpretations of paleomagnetic observations assume that naturally occurring magnetic particles can retain their primary magnetic recording over billions of years. The ability to retain a magnetic recording is inferred from laboratory measurements, where heating causes demagnetization on the order of seconds.
This review provides a convenient reference for researchers to explore the magnetic properties of single-domain magnetic particles and promotes their application and development in the field of ...
MAGNETIC PROPERTIES OF SINGLE-DOMAIN PARTICLES AND THE ROCK REMANENCE. ... Some features of this site may not work without it. MAGNETIC …
The magnetization, magnetostriction and magnetoresistance of a randomly oriented assembly of single-domain particles have been calculated as a function of magnetic field. The particles are assumed to have either cubic or uniaxial anisotropy and the calculations extend over a much greater range of field strengths than previous ones.
Magnetic hysteresis measurements of sediments have resulted in widespread reporting of "pseudo-single-domain"-like magnetic properties.
[2] In rock magnetism the interpretation of a magnetic measurement is based on our understanding of the fundamental behavior of common magnetic minerals. Many aspects of natural magnetic minerals, e.g., variation in stoichiometry and grains size, and their standard magnetic properties, e.g., hysteresis, have been rigorously studied. …
Air-stable, single-domain Fe and Fe-Co particles prepared by the reaction of the metal salts with aqueous borohydride have higher coercivities and axial ratios if prepared in a magnetic field. Oxide and boride impurities are indicated by elemental analyses and lowered saturation magnetizations.
A magnetic particle that stays in the single-domain state for all magnetic fields is called single-domain particles, which are very small, generally below a micrometer in diameter. Because they have a high coercivity, they are very important in many applications such as hard magnets and magnetic memory.
On the determination of magnetic grain‐size distributions of superparamagnetic particle ensembles using the frequency dependence of susceptibility at different temperatures
The grain size dependence of various mineral (rock) magnetic parameters has been determined, using a series of essentially pure, fine-grained (single-domain, SD) and …
The magnetic properties of small ferromagnetic particles with diameters typically about 10 nm are governed by two characteristic features. Namely, the single-domain magnetic …
Isothermal remanent magnetization (IRM) curves are used widely in rock magnetic and environmental magnetic studies to characterize magnetic properties of natural samples. Previous theoretical and experimental investigations indicate that magnetostatic interactions can strongly affect the IRM behavior. In order to quantitatively …
Single-domain theory1 has been remarkably successful as a theoretical basis for rock magnetism and hence palaeomagnetism. However, the grain size of much of the …
The bacteria and the ultra-fine grained, single domain magnetite (Fe 3 O 4) they produce were extracted from the sediments and studied with transmission electron microscopy. Magnetic properties of the sediments were measured by rock magnetic techniques using a SQUID magnetometer.
The overwhelming evidence from these authors was that stable natural magnetic remanence in rocks resides within ultrafine, uniformly magnetized particles, called single-domain (SD) particles.
ES4004 afremov and belokon: magnetic properties of single-domain particles ES4004 been often applied to the construction of theories describing the properties of various …
This observation is best reconciled by the fact that materials studied in paleomagnetism and rock magnetism almost always have magnetic particle size and shape distributions, …
The role of single-domain (SD) magnetic particles in creation of inverse magnetic fabrics is investigated on simple mathematical models using a realistic estimate for SD intrinsic susceptibility. In contrast to the fraction created by multi-domain (MD) particles, in which the anisotropy of magnetic susceptibility (AMS) is controlled by both …
The stable orientations of the net magnetic moment within single-domain particles: Experimental evidence for a range of stable states and implications for rock magnetism and palaeomagnetism
easy axis and the critical field of the grain magnetic moment, i.e. the magnetic state of an individual particle. The nonmonotonic variation in the critical field due to an external eect can lead, in the presence of a magnetic field, to the formation of a remanence additional …
Rock Magnetism, first published in 1997, is a comprehensive treatment of fine particle magnetism and the magnetic properties of rocks. Starting from atomic magnetism and magnetostatic principles, the authors explain why domains and micromagnetic structures form in ferromagnetic crystals and how these lead to magnetic memory in the form of …
The content of magnetite and other magnetic minerals in urban soils is tens and hundreds of times higher than their background values. The properties of techno genic magnetics are also different: whereas background soils are dominated by thin superparamagnetic and singledomain particles, large multidomain particles pr evail in urban soils.
In the first number of the Physics of the Solid Earth (2009), the article "Magnetic Aftereffect in Systems of SingleDomain Interacting Particles and Magnetic Vis cosity of Rocks" by L.L. Afremov, V.I. Belokon', and K.V. Nefedev was published. In the abstract of the article the following was written, inter alia: "Under the approxi mation of …
