gyromagneticadj.

/ˌdʒʌɪərəʊmaɡˈnɛtɪk/

Etymology: See gyro- comb. form.

1. Physics. Of or pertaining to the interdependence of the angular momentum of a spinning charged particle and its resulting magnetic moment; gyromagnetic effect: any effect arising from this interdependence, esp. the fact that a change in the angular momentum of a freely suspended magnetizable body will produce a change in its magnetic moment, and vice versa; gyromagnetic ratio: the ratio of the angular momentum of a spinning charged particle to its magnetic moment; also, the reciprocal of this, expressed either as a true ratio (symbol γ) or as a dimensionless quantity (symbol g′).

ΘΚΠ

the world > matter > physics > quantum theory > electron spin > [noun] > effect of magnetic moment

gyromagnetic effect1922

the world > matter > physics > quantum theory > electron spin > [noun] > ratio

gyromagnetic ratio1922

the world > matter > physics > quantum theory > electron spin > [adjective] > relating to interrelationship

gyromagnetic1922

magneto-mechanical1925

1922 O. W. Richardson in Proc. Royal Soc. (1923) A. 102 538 (heading) The magnitude of the gyromagnetic ratio.

1922 O. W. Richardson in Proc. Royal Soc. (1923) A. 102 539 We are now practically driven..to the conclusion that the motions of the positively charged parts of the atoms cannot be disregarded in considering these gyromagnetic phenomena.

1923 Philos. Trans. (Royal Soc.) A. 223 257 (heading) On the Richardson gyro~magnetic effect.

1930 S. J. Barnett Evid. on Elem. Magnet from Res. on Gyromagn. Phenomena 12 Rotating a rod about its axis at a speed of N revolutions per second magnetizes it exactly as it would be magnetized by applying to it an axial magnetic field with intensity H = 2πsN, where s is the ratio of the rotary momentum of the elementary magnet to its magnetic moment. This ratio is known as the gyromagnetic ratio, or magneto~mechanical ratio.

1953 C. Kittel Introd. Solid State Physics x. 165 Gyromagnetic experiments identify the magnetization in ferromagnetics as arising largely from the electron spin, rather than from the orbital moment.

1953 C. Kittel Introd. Solid State Physics x. 165 The magnetomechanical ratio is defined as the ratio of the magnetic moment to the angular momentum. [Note] This quantity..is sometimes called the gyromagnetic ratio, but strictly speaking the gyromagnetic ratio is the reciprocal of the magnetomechanical ratio.

1961 Encycl. Dict. Physics III. 551/1 Gyromagnetic phenomena are to be expected in paramagnetic as well as ferromagnetic materials.

1967 Electronics 6 Mar. 54/2 The NBS now uses the gyromagnetic ratio of a proton to determine the constancy of its standard voltage.

2. Applied to a type of compass in which a magnetic compass automatically corrects the gradual deviations of a directional gyroscope, which in turn provides the compass reading.

ΘΚΠ

society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [adjective] > specific type of compass

gyromagnetic1946

1946 Wells & Glenny in M. Davidson Gyroscope iii. ii. 170 A gyro-magnetic compass..should not be confused with a gyro-stabilised magnetic compass.

1952 H. L. Hitchins & W. E. May Lodestone to Gyro-compass viii. 159 In the gyro-magnetic system a gyroscope is maintained in a nearly fixed direction by intermittent or continuous signals from some sort of magnetic compass. The gyroscope then operates the repeaters.

1957 Encycl. Brit. VI. 176/1 In the gyro-magnetic compass..the gyro-direction indicator and magnetic compass are combined in one instrument and the necessity for hand adjustment disappears.

This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018).

单词	gyromagnetic
释义	gyromagneticadj. /ˌdʒʌɪərəʊmaɡˈnɛtɪk/ Etymology: See gyro- comb. form. 1. Physics. Of or pertaining to the interdependence of the angular momentum of a spinning charged particle and its resulting magnetic moment; gyromagnetic effect: any effect arising from this interdependence, esp. the fact that a change in the angular momentum of a freely suspended magnetizable body will produce a change in its magnetic moment, and vice versa; gyromagnetic ratio: the ratio of the angular momentum of a spinning charged particle to its magnetic moment; also, the reciprocal of this, expressed either as a true ratio (symbol γ) or as a dimensionless quantity (symbol g′). ΘΚΠ the world > matter > physics > quantum theory > electron spin > [noun] > effect of magnetic moment gyromagnetic effect1922 the world > matter > physics > quantum theory > electron spin > [noun] > ratio gyromagnetic ratio1922 the world > matter > physics > quantum theory > electron spin > [adjective] > relating to interrelationship gyromagnetic1922 magneto-mechanical1925 1922 O. W. Richardson in Proc. Royal Soc. (1923) A. 102 538 (heading) The magnitude of the gyromagnetic ratio. 1922 O. W. Richardson in Proc. Royal Soc. (1923) A. 102 539 We are now practically driven..to the conclusion that the motions of the positively charged parts of the atoms cannot be disregarded in considering these gyromagnetic phenomena. 1923 Philos. Trans. (Royal Soc.) A. 223 257 (heading) On the Richardson gyro~magnetic effect. 1930 S. J. Barnett Evid. on Elem. Magnet from Res. on Gyromagn. Phenomena 12 Rotating a rod about its axis at a speed of N revolutions per second magnetizes it exactly as it would be magnetized by applying to it an axial magnetic field with intensity H = 2πsN, where s is the ratio of the rotary momentum of the elementary magnet to its magnetic moment. This ratio is known as the gyromagnetic ratio, or magneto~mechanical ratio. 1953 C. Kittel Introd. Solid State Physics x. 165 Gyromagnetic experiments identify the magnetization in ferromagnetics as arising largely from the electron spin, rather than from the orbital moment. 1953 C. Kittel Introd. Solid State Physics x. 165 The magnetomechanical ratio is defined as the ratio of the magnetic moment to the angular momentum. [Note] This quantity..is sometimes called the gyromagnetic ratio, but strictly speaking the gyromagnetic ratio is the reciprocal of the magnetomechanical ratio. 1961 Encycl. Dict. Physics III. 551/1 Gyromagnetic phenomena are to be expected in paramagnetic as well as ferromagnetic materials. 1967 Electronics 6 Mar. 54/2 The NBS now uses the gyromagnetic ratio of a proton to determine the constancy of its standard voltage. 2. Applied to a type of compass in which a magnetic compass automatically corrects the gradual deviations of a directional gyroscope, which in turn provides the compass reading. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [adjective] > specific type of compass gyromagnetic1946 1946 Wells & Glenny in M. Davidson Gyroscope iii. ii. 170 A gyro-magnetic compass..should not be confused with a gyro-stabilised magnetic compass. 1952 H. L. Hitchins & W. E. May Lodestone to Gyro-compass viii. 159 In the gyro-magnetic system a gyroscope is maintained in a nearly fixed direction by intermittent or continuous signals from some sort of magnetic compass. The gyroscope then operates the repeaters. 1957 Encycl. Brit. VI. 176/1 In the gyro-magnetic compass..the gyro-direction indicator and magnetic compass are combined in one instrument and the necessity for hand adjustment disappears. This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018). < adj.1922
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