perpendicular magnetization
71Samarium-cobalt magnet — Samarium cobalt magnets are primarily composed of samarium and cobalt. They have been available since the early 1970s. This type of rare earth magnet is very powerful, however they are brittle and prone to cracking and chipping. Samarium cobalt… …
72Quantum critical point — A quantum critical point is a special class of continuous phase transition that takes place at the absolute zero of temperature, typically in a material where the phase transition temperature has been driven to zero by the application of a… …
73Classical electromagnetism and special relativity — This article is about the contribution of special relativity to the modern theory of classical electromagnetism. For the contribution of classical electromagnetism to the development of special relativity, see History of special relativity. For a …
74radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …
75Centimetre–gram–second system of units — CGS redirects here. For other uses, see CGS (disambiguation). The centimetre–gram–second system (abbreviated CGS or cgs) is a metric system of physical units based on centimetre as the unit of length, gram as a unit of mass, and second as a unit… …
76Near-surface geophysics — is the use of geophysical methods to investigate small scale features in the shallow (tens of meters) subsurface. It is closely related to applied geophysics or exploration geophysics. Methods used include seismic refraction and reflection,… …
77Interacción de canje — Dos orbitales d de iones metálicos vecinos: la interacción de canje J se produce entre dos electrones con el mismo número cuántico de espín Ms, e impide que …
