Noise of ferromagnetic materials

Bittel, Heinz

doi:10.1109/tmag.1969.1066547

Cited by 92 publications

(63 citation statements)

References 4 publications

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“…Observations (Chakrabarty et al, 2003) of a ''speed limit'' for pulsars seem to support the theory (Bildsten, 1998) that gravitational radiation works to brake the spin of the fastest pulsars before they are ripped apart by their relativistic spins. Expectations from neutron star models indicate that the ellipticity may range from 10 À9 to 10 À6 (Ushomirsky, Cutler, and Bildsten, 2000;Owen, 2006) for conventional neutron stars and somewhat larger for more exotic stars (Owen, 2005).…”

Section: Pulsarsmentioning

confidence: 81%

“…3). The GEO600 detector has achieved a power gain of 1000 using power recycling (Blair et al, 2012).…”

Section: B Power Recyclingmentioning

confidence: 99%

“…This requires the mirror actuator to be highly linear: the upconversion of force noise must be less than 1 part in 10 9 . While such a high dynamic range is possible with just modern low noise electronics, it is not feasible to do so using magnetic actuators, due to the Barkhausen effect (Barkhausen, 1919;Bittel, 1969;Bertotti, 1998;Durin and Zapperi, 2004). The low-frequency control forces are applied to the mirror using magnet-coil pairs.…”

Section: Actuator Nonlinearitiesmentioning

confidence: 99%

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Gravitational radiation detection with laser interferometry

2014

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Gravitational-wave detection has been pursued relentlessly for over 40 years. With the imminent operation of a new generation of laser interferometers, it is expected that detections will become a common occurrence. The research into more ambitious detectors promises to allow the field to move beyond detection and into the realm of precision science using gravitational radiation. In this article, the state of art for the detectors is reviewed and an outlook for the coming decades is described.

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Section: Pulsarsmentioning

confidence: 81%

“…3). The GEO600 detector has achieved a power gain of 1000 using power recycling (Blair et al, 2012).…”

Section: B Power Recyclingmentioning

confidence: 99%

Section: Actuator Nonlinearitiesmentioning

confidence: 99%

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Gravitational radiation detection with laser interferometry

2014

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“…can vary discontinuously when driven by external forces such as temperature [1][2][3], magnetic field [4][5][6][7][8][9], stress [10], and chemical potential [11]. The size of these changes can range over many orders of magnitude.…”

mentioning

confidence: 99%

Avalanches in vanadium sesquioxide nanodevices

2015

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“…Originally detected through a pair of loud speakers by Barkhausen in 1919, hence the term "Barkhausen Noise", it is the resulting voltage spikes that are usually recorded and analysed. Sources of noise in ferromagnetic materials have been reviewed by Bittel (1969).…”

mentioning

confidence: 99%

The magnetic properties of plastically deformed steels

Thompson¹,

Tanner²

1990

Journal of Magnetism and Magnetic Materials

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The magnetic properties of plastically deformed steels. The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source• a link is made to the metadata record in Durham E-Theses• the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. The copyright of this thesis rests with the author.No quotation from it should be published without his prior written consent and information derived from it should be acknowledged. The changes in the magnetic properties after tensile deformation are similar to those due to elastic compressive stress, with an additional increase in the coercivity. For the initial magnetisation curve initial permeability (J-Li) and maximum relative permeability both decrease, while the field at which the latter occurs (Hm) The Magnetic Properties of Plastically Deformed Steelsincreases. The hysteresis curve shears over reducing the maximum differential permeability and the remanence and also increasing the coercivity. These results and the change in the shape of the hysteresis curve, most noticeable in the low carbon steels, are explained in terms of the reduction in easy domain wall movement due to the dislocation tangles, as observed under the electron microscope, and to the magnetostrictive effect of the compressive residual stress.Inter-relationships are found between coercivity and both J-Li and Hm. The coercivity io also found to vary linearly with both Vickers Hardness and Yield Stress. The Kneppo formula for the initial magnetisation curve is found to hold better for the higher carbon content steels with the fit deteriorating with increasing plastic deformation.

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Noise of ferromagnetic materials

Cited by 92 publications

References 4 publications

Gravitational radiation detection with laser interferometry

Gravitational radiation detection with laser interferometry

Avalanches in vanadium sesquioxide nanodevices

The magnetic properties of plastically deformed steels

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