samarium-cobalt magnet


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samarium-cobalt magnet

[sə′mar·ē·əm ′kō‚bȯlt ′mag·nət]
(electromagnetism)
A rare-earth permanent magnet that is more efficient, has lower leakage and greater resistance to demagnetization, and can be magnetized to higher levels than conventional permanent magnets.
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[9] Tsutsui H et al found Samarium-Cobalt magnet to be superior in magnetic properties to other magnets.
have developed a new high-iron concentration samarium-cobalt magnet that is free of heavy rare earth elements, highly resistant to demagnetization, and that achieves significantly superior magnetic properties at high temperatures to the heat-resistant neodymium magnets currently used in motors.
Toshiba has investigated dysprosium-free motors, and in 2012 developed a high-iron concentration samarium-cobalt magnet that outperformed neodymium magnets at the high temperatures that start to degrade performance and ultimately cause demagnetization.
In its latest breakthrough, Toshiba has now developed a high-iron samarium-cobalt magnet that realizes high level demagnetization resistance at 180C, outperforms neodymium magnets at 140C, and that, due to application of Toshiba-developed heat treatment, offers 30% better coercivity than the magnet developed in 2012.
The first is local or systemic administration of medicines such as prostaglandins, interleukins, leukotrienes, cyclic adenosine monophosphate, and vitamin D.2-5 The second category is mechanical or physical stimulation such as direct electrical current6 or a samarium-cobalt magnet.7 The last category is oral surgery, including gingival fiberotomy,8 alveolar surgery, and distraction osteogenesis.
Although it is less brittle than sintered samarium-cobalt magnet but it has a lower working temperature and corrosion resistance is very poor thus protecting coatings are necessary to protect from corrosion.
One of the first studies by Tustsui et al in 1979(6) found that the corrosion resistance of the samarium-cobalt magnet was similar to that of usual dental casting alloys but the add resistance was relatively low.
The magnetic brackets are chromium plated samarium-cobalt magnet soldered to the base of an edgewise bracket which can be directly bonded to tooth.
There are two types: neodymium magnets and samarium-cobalt magnets. Magnetostrictive rare-earth magnets such as Terfenol-D also have applications, e.g.
Samarium-Cobalt Magnets: Samarium-cobalt (SmCo) magnets were developed in the 1960s and 1970s.
This appliance used four pairs of repelling samarium-cobalt magnets to produce a posterior intrusive force of 700 grams per magnetic unit.
Samarium-cobalt magnets embedded in unilateral blocks of acrylic were used to stimulate growth following an autogenous costochondral graft (59).