Results 241 to 250 of about 69,968 (288)

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

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

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

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

Multifunctional Superparamagnetic Janus Particles

Langmuir, 2009
In this study, we report the microfluidic-based synthesis of a multifunctional Janus hydrogel particle with anisotropic superparamagnetic properties and chemical composition for the bottom-up assembly of hydrogel superstructures. In a uniform magnetic field, the resulting Janus magnetic particles fabricated in the present method exhibit chainlike or ...
Kai P, Yuet, Dae Kun, Hwang, Ramin, Haghgooie, Patrick S, Doyle   +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

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

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

Electrical control of superparamagnetism

Applied Physics Express, 2016
Abstract The electric field control of superparamagnetism is realized using a Cu/Ni system, in which the deposited Ni shows superparamagnetic behavior above the blocking temperature. An electric double-layer capacitor (EDLC) with the Cu/Ni electrode and a nonmagnetic counter electrode is fabricated to examine the electric field effect on
Kihiro T. Yamada, Tomohiro Koyama, Haruka Kakizakai, Kazumoto Miwa, Fuyuki Ando, Mio Ishibashi, Kab-Jin Kim, Takahiro Moriyama, Shimpei Ono, Daichi Chiba, Teruo Ono   +10 more
openaire   +1 more source

Plasmonic Gold−Superparamagnetic Hematite Heterostructures

Langmuir, 2011
Bifunctional heterostructures composed of gold nanorods and hematite nanoparticle aggregates are prepared facilely through the hydrothermal decomposition of ferric acetylacetonate on the surface of the nanorods. The gold nanorod in the heterostructure is partially coated with the hematite nanoparticle aggregates. The hematite coating is porous.
Ngai, To, Bao, Zhihong, Li, Zifu, Sun, Zhenhua, Tian, Linwei, Wang, Jianfang   +5 more
openaire   +4 more sources