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Alternating gradient force magnetometry: Applications and extension to low temperatures (invited) : 37th Annual conference on magnetism and magnetic materials (1993)

O'Grady, K. ; Lewis, V. G. ; Dickson, D. P. E.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 5608-5613

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: This paper describes the results of a study undertaken to determine the sensitivity and reproducibility of a commercially produced alternating gradient force magnetometer. A noise base of 2×10−8 emu is achievable with an averaging time of 1 s. Reproducibility was found to be within 6% for most samples, but increases to 20% with low moment samples. The effect of the alternating field gradient on magnetic measurements has been fully investigated. The alternating field gradient is found to have significant effects on samples with a low fluctuation field and low coercivity. A low temperature system (4–300 K) is described and modifications to improve the sensitivity and base temperature are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.353613

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Digitale Medien

Reptation effects in particulate systems. II. Experimental studies : 37th Annual conference on magnetism and magnetic materials (1993)

Lewis, V. G. ; Mayo, P. I. ; O'Grady, K.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 6656-6658

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: In this paper we report the results of experimental reptation measurements on a chromium dioxide videotape sample. The reptation-induced changes in magnetization are found to be due entirely to thermally activated reversals which are strongly influenced by the sweep rate of the cycling applied field. This experimental evidence is found to be in exact agreement with the theoretical predictions of sweep-rate-dependent time-dependence and reptation effects published in the preceding article [El-Hilo et al. (these proceedings)].

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.352546

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Digitale Medien

Giant magnetoresistance in Ag1−xNix−yFey heterogeneous alloy films : 38th Annual Conference on Magnetism and Magnetic Materials (1994)

Watson, M. L. ; Lewis, V. G. ; O'Grady, K.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 75 (1994), S. 6927-6929

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We have investigated the effects of phase segregation and compositional variation on the giant magnetoresistance (GMR) observed in heterogeneous AgNiFe alloy films. The films were sputtered from a mosaic Ag/NiFe/Fe target onto glass substrates at the system ambient temperature. They had a thickness of 200–300 nm, and were rapidly thermally annealed (RTA) under vacuum in order to promote phase segregation. By altering the amount of Fe in the target mosaic, the Ni:Fe ratio was systematically varied from 80:20 to 34:66 atomic percent. The Ag concentration for all films was fixed at 78±5 atomic percent. The GMR was maximized using a RTA temperature of 650 °C. Annealing at higher temperatures decreased the saturation field of the GMR, but also lowered its size. Changing the film composition had little effect on the saturation field of the GMR, but for both as-deposited and optimally annealed samples the magnetoresistance was found to decrease as the Ni concentration decreased.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.356783

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