News tagged with ferromagnet
An unlikely route to ferroelectricity
(Phys.org) -- Ferroelectricity, which was first observed in the 1940s, is an interesting phenomenon involving the spontaneous (non-induced) formation of charge polarization (separation of charge) in certain ...
May 18, 2012 |
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Ferroelectric oxides do the twist
(Phys.org) -- Some materials, by their nature, do what we want them to do -- notably, the ubiquitous, semiconducting silicon found in almost every electronic device. But sometimes, naturally occurring materials ...
Apr 12, 2012 |
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Magnetic cloak: Physicists create device invisible to magnetic fields
Autonomous University of Barcelona researchers, in collaboration with an experimental group from the Academy of Sciences of Slovakia, have created a cylinder which hides contents and makes them invisible to ...
Mar 22, 2012 |
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Hall effect magnetic field sensors for high temperatures and harmful radiation environments
Toyohashi Tech researchers have fabricated Hall effect magnetic field sensors operable at least 400 C and in extreme radiation conditions using gallium nitride-based heterostructures a with two-dimensional ...
Mar 22, 2012 |
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An electrical switch for magnetic current
(PhysOrg.com) -- A new mechanism will make it possible to switch data storage in the future. Researchers at the Max Planck Institute of Microstructure Physics in Halle use a short electric pulse to change ...
Mar 01, 2012 |
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Researchers resolve controversy over gallium manganese arsenide that could boost spintronic performance
A long-standing controversy regarding the semiconductor gallium manganese arsenide, one of the most promising materials for spintronic technology, looks to have been resolved. Researchers with the Lawrence ...
Feb 27, 2012 |
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Physicists finds new path toward increasing semiconductor functionality
(PhysOrg.com) -- The past decade has seen the emergence of the field of spintronics, aimed at increasing the efficiency of information processing and computer memories. The idea behind spintronics is to harness the magnetic ...
Feb 24, 2012 |
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Mn-doped ZnS is unsuitable to act as a dilute magnetic semiconductor
Dilute magnetic semiconductors (DMS) have recently been a major focus of magnetic semiconductor research. A laboratory from the University of Science and Technology of China explored the feasibility of doping ...
Feb 20, 2012 |
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Origin of large polarization in multiferroic YMnO3 thin films
Multiferroic materials have attracted much interest because of their ability to control magnetism through the application of a voltage. This ability can be utilized to reduce the power required by electronic ...
Feb 16, 2012 |
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A 50-year quest to isolate the thermoelectric effect is now over: Magnon drag unveiled
In a paper published in Nature Materials, a group of researchers at the Catalan Institute of Nanotechnology (ICN, Spain) led by Prof. Sergio O. Valenzuela reports the observation of the magnon drag. This w ...
Dec 18, 2011 |
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New nanostructure-based process will streamline production of magnetic materials
Scientists at the University of Massachusetts Amherst report that for the first time they have designed a much simpler method of preparing ordered magnetic materials than ever before, by coupling magnetic ...
Sep 27, 2011 |
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Physicists discover 'magnetotoroidic effect'
(PhysOrg.com) -- For many years, scientists have known about the magnetoelectric effect, in which an electric field can induce and control a magnetic field, and vice versa. In this effect, the electric field has always been ...
Sep 26, 2011 |
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Building better memories with supramolecular structures that act as tiny magnets
In a step towards realizing ultrahigh-density storage devices based on individual molecules behaving as magnets, researchers in Japan have developed a candidate building block -- a supramolecular ferromagnet, ...
Sep 16, 2011 |
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Novel magnetic material operates under extreme stress conditions
(PhysOrg.com) -- Ferromagnetic materials are key ingredients in vast arrays of technologies including wind turbines, computer hard-disks, credit card readers, and many more. Typically these magnets operate ...
Sep 16, 2011 |
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CNST offers insights into metallic ferromagnetism using spin polarized electron probes
The Center for Nanoscale Science and Technology's Daniel Pierce has provided an overview of three decades of applications of spin-polarized measurement techniques to understanding metallic ferromagnetism.
Jun 16, 2011 |
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Ferromagnetism
Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. In physics, several different types of magnetism are distinguished. Ferromagnetism (including ferrimagnetism) is the strongest type; it is the only type that creates forces strong enough to be felt, and is responsible for the common phenomena of magnetism encountered in everyday life. Other substances respond weakly to magnetic fields with two other types of magnetism, paramagnetism and diamagnetism, but the forces are so weak that they can only be detected by sensitive instruments in a laboratory. An everyday example of ferromagnetism is a refrigerator magnet used to hold notes on a refrigerator door. The attraction between a magnet and ferromagnetic material is "the quality of magnetism first apparent to the ancient world, and to us today".
Permanent magnets (materials that can be magnetized by an external magnetic field and remain magnetized after the external field is removed) are either ferromagnetic or ferrimagnetic, as are other materials that are noticeably attracted to them. Only a few substances are ferromagnetic; the common ones are iron, nickel, cobalt and their alloys, some compounds of rare earth metals, and a few naturally-occurring minerals such as lodestone.
For more information about Ferromagnetism, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
