Telegraph noise in silver-Permalloy giant magnetoresistance test structures

Abstract

We report noise data for discontinuous Ni82Fe18/Ag multilayer test structures. Examination of the noise data for this material indicates that random telegraph fluchator (RTF) noise of the resistance is the predominant noise source. Analysis of the RTF noise in these structures presents an opportunity to estimate magnetic domain or magnetic cluster strengths and the domain-domain interactions.

Size effects and giant magnetoresistance in unannealed NiFe/Ag multilayer stripes

“…10 The unannealed NiFe/Ag is potentially more attractive for applications since the annealing step is avoided. It may also decrease the noise previously observed in small devices, 8,9,11 if the granular characteristics are eliminated. Hylton et al 10 studied unannealed arrays of 2 m dots consisting of two NiFe layers separated by a Ag spacer.…”

Observation of a fluctuation-enhanced magnetoresistance inNi81Fe19/AgRogers1, Kirschenbaum2, Beale3 et al. 1997Phys. Rev. B2000View full textAdd to dashboardCite

“…First, we consider the observed 1/f -like spectrum: It is known 15 that resistance fluctuations from individual magnetic domains can be observed in the low-frequency resistance noise of small NiFe/Ag multilayer structures. For micrometersized devices, single domain reorientations result in discrete changes in device resistance on the order of 1 m⍀.…”

Nonlinear AC response and noise of a giant magnetoresistive sensor

“…Both the quasi-equilibrium thermal noise and the Barkhausen noise provide information about the size of the magnetic domains and the processes by which they align [4]- [7]. In this paper, we combine measurements of fine structure in the ac response of a particular GMR sensor with measurements of noise spectra and non-Gaussian statistics to obtain such information on a particular sensor.…”