Title :
Thermal noise in linear damped systems
Author :
Mallinson, John C.
Author_Institution :
Mallinson Magnetics Inc., Belmont, CA, USA
fDate :
9/1/2002 12:00:00 AM
Abstract :
It is frequently assumed that estimating the noise, or thermal fluctuations, in a damped linear system necessarily depends on knowing the precise magnitude of the damping or energy dissipative component of the system. This paper proves that this notion is incorrect by considering the noise power of a resistor. It then shows that the magnetization fluctuation noise power of a spin-valve giant magnetoresistive head, a subject of considerable current interest, can be analyzed in a particularly simple and straightforward manner without knowing the exact value of the gyromagnetic damping factor
Keywords :
giant magnetoresistance; linear systems; magnetic heads; magnetic recording noise; magnetisation; spin valves; thermal noise; linear damped systems; magnetization fluctuation; noise power; spin-valve giant magnetoresistive head; thermal fluctuations; thermal noise; Capacitors; Circuit noise; Damping; Equivalent circuits; Fluctuations; Frequency; Giant magnetoresistance; Low-frequency noise; Noise shaping; Resistors;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.802704
