Results 151 to 160 of about 68,825 (177)

Superparamagnetism in hematite

Earth and Planetary Science Letters, 1967
It is well known that small particles of ferromagnetic material show superparamagnetic behavior. The magnetic properties of hematite, which has a weak spontaneous magnetization show superparamagnetic behavior in grains which are as large as 1/4 to 1/2 μ in diameter.
D.W. Strangway, B.E. McMahon, R.M. Honea, E.E. Larson   +3 more
openaire   +1 more source

Degeneration of biogenic superparamagnetic magnetite

Geobiology, 2009
ABSTRACTMagnetite crystals precipitated as a consequence of Fe(III) reduction by Shewanella algae BrY after 265 h incubation and 5‐year anaerobic storage were investigated with transmission electron microscopy, Mössbauer spectroscopy and X‐ray diffraction. The magnetite crystals were typically superparamagnetic with an approximate size of 13 nm.
Vali, H, Konhauser, K, Pfiffner, SM, Phelps, TJ, Dyar, MD, Rondinone, AJ, Cole, DR, Li, YL   +7 more
openaire   +4 more sources

Extruded Superparamagnetic Saloplastic Polyelectrolyte Nanocomposites

ACS Applied Materials & Interfaces, 2014
Iron oxide nanoparticles of diameter ca. 12 nm were dispersed into polyelectrolyte complexes made from poly(styrenesulfonate) and poly(diallyldimethylammonium). These nanocomposites were plasticized with salt water and extruded into dense, tough fibers.
Jingcheng, Fu, Qifeng, Wang, Joseph B, Schlenoff   +2 more
openaire   +2 more sources

Superparamagnetic nanoparticles in tap water

Water Research, 2007
Magnetization measurements are a useful tool in the characterization of corrosion products formed in municipal water pipes made of iron or steel. Fine particles formed in corrosion processes exhibit superparamagnetic behavior. The size of such particles, which determines their capacity to adsorb hazardous species, can therefore be found from magnetic ...
Frank E, Senftle, Arthur N, Thorpe, Julius R, Grant, Aaron, Barkatt   +3 more
openaire   +2 more sources

Superparamagnetic enhancement of thermoelectric performance

Nature, 2017
The ability to control chemical and physical structuring at the nanometre scale is important for developing high-performance thermoelectric materials. Progress in this area has been achieved mainly by enhancing phonon scattering and consequently decreasing the thermal conductivity of the lattice through the design of either interface structures at ...
Wenyu, Zhao, Zhiyuan, Liu, Zhigang, Sun, Qingjie, Zhang, Ping, Wei, Xin, Mu, Hongyu, Zhou, Cuncheng, Li, Shifang, Ma, Danqi, He, Pengxia, Ji, Wanting, Zhu, Xiaolei, Nie, Xianli, Su, Xinfeng, Tang, Baogen, Shen, Xiaoli, Dong, Jihui, Yang, Yong, Liu, Jing, Shi   +19 more
openaire   +2 more sources

Interaction of superparamagnetic and non-superparamagnetic particles in magnetic fluid

Journal of Magnetism and Magnetic Materials, 1995
Magnetic fluids are known to contain superparamagnetic and non-superparamagnetic particles. In this paper, an attempt has been made to show the interaction between superparamagnetic and non-superparamagnetic particles experimentally by measuring the initial susceptibility, over a wide temperature range, of manganese-zinc ferrite and cobalt ferrite ...
B. Jeyadevan, K. Nakatsuka
openaire   +1 more source

Elongated superparamagnetic particles

Journal of Applied Physics, 1994
The relaxation time for superparamagnetic behavior is calculated for prolate spheroidal particles with a uniaxial, crystalline anisotropy superimposed on their shape anisotropy. Possible applications to the analysis of some experiments, in particular for the case of quantum tunneling, are discussed.
openaire   +1 more source

Transition in spin dependent transport from superparamagnetic-superparamagnetic to superparamagnetic-ferromagnetic in sputtered Cu100–xCox granular films

Journal of Applied Physics, 2012
The transition in the spin-dependent transport from superparamagnetic-superparamagnetic (SPM-SPM) to superparamagnetic-ferromagnetic (SPM-FM) in room temperature co-sputtered granular Cu100−xCox (x = 15.1–30.9 at. %) thin films is tracked by varying the cobalt concentration.
Dinesh Kumar, Sujeet Chaudhary, Dinesh K. Pandya   +2 more
openaire   +1 more source

Smallest Bimetallic CoPt₃ Superparamagnetic Nanoparticles

The Journal of Physical Chemistry Letters, 2016
We present for the first time a nonaqueous sol-gel route to produce ultrasmall (
Karmaoui M., Amaral J. S., Lajaunie L., Puliyalil H., Tobaldi D. M., Pullar R. C., Labrincha J. A., Arenal R., Cvelbar U.   +8 more
openaire   +5 more sources

Magnetocaloric effect in superparamagnets

Journal of Magnetism and Magnetic Materials, 1992
The magnetocaloric effect is calculated for superparamagnetic materials as a function of temperature, field and cluster size. Assuming classical behavior, a universal curve is calculated from which an optimum cluster moment may be found for maximum entropy change upon application of a given field H at a given temperature T. Quantum effects are shown to
R.D. McMichael, R.D. Shull, L.J. Swartzendruber, L.H. Bennett, R.E. Watson   +4 more
openaire   +1 more source