Temperature dependence of the magnetoresistance of sputtered Fe/Cr superlattices

Mattson, J. E.; Brubaker, Mary E.; Sowers, C. H.; Conover, M. J.; Qiu, Z. Q.; Bader, S. D.

doi:10.1103/physrevb.44.9378

Cited by 86 publications

(38 citation statements)

References 26 publications

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“…The m exponent very slightly increases with annealing temperature ͓from 0.82 for A͑as-cast͒ to 0.88 for A͑750͒, and from 0.81 for B͑as-cast͒ to 0.82 for B͑750͔͒. Those values are far from the mϭ1.5-2 exponents found in magnetic multilayers, 17,25 in which it has been shown that the electron-magnon scattering leads to these power laws and, consequently, the main mechanism responsible for the thermal decrease of ⌬ M is the spin mixing process associated with this interaction. On the contrary, our values are in close agreement with the mϭ0.8 exponent obtained by Wang and Xiao 16 in granular Co 20 Ag 80 thin film.…”

Section: Fig 9 M (Th) Vs T At Various Fieldsmentioning

confidence: 85%

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Magnetotransport properties of NiFe–Ag granular alloys: Origin of the thermal behavior

Badía

Batlle

Labarta

et al. 1997

Journal of Applied Physics

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The effect of the temperature and magnetic field on the giant magnetoresistivity ͑GMR͒ of two FeNi-Ag granular alloys of composition Fe 11.4 Ni 6.4 Ag 82.2 and Fe 7.6 Ni 16.4 Ag 76.0 is discussed. Both samples were prepared by rf magnetron sputtering. Parts of them were rapidly annealed at 600, 650, and 750°C. All samples displayed giant magnetoresistivity which decays from its maximum value with a T m behavior, with mϷ0.8-0.9, suggesting that the decrease in the maximum magnetoresistivity is due to the reduction in the particle magnetization associated with the spin wave excitation, which is a different mechanism to the electron-magnon interaction responsible for the T dependence of GMR in magnetic multilayers. Magnetoresistivity M decreases with temperature sharing essentially the same temperature decrease as the square of the macroscopic magnetization M in the whole magnetic field range studied, which is due to the reduction in the particle magnetization and to superparamagnetic effects. The effect of the width of the particle size distribution and interparticle interactions on the linear relation M vs M 2 are discussed. Care should be taken when representing M /(T,Hϭ0) vs (M /M s ) 2 because the strong temperature-dependent slope shown in these plots is mainly due to the temperature dependence of both the resistivity (T,Hϭ0) and M s , and it is not an intrinsic T dependence of GMR in granular alloys. Experimental results suggest that in granular materials, magnetoresistivity is dominated by magnetic moments at the surface of the particles, which also play a very important role in the demagnetization processes, and small magnetic particles.

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Section: Fig 9 M (Th) Vs T At Various Fieldsmentioning

confidence: 85%

“…where (T,H) is the resistivity measured at a temperature T and in an applied magnetic field H. We assume that the total resistivity at T and H is given by 17 ͑T,…”

Section: Magnetoresistivitymentioning

confidence: 99%

Magnetotransport properties of NiFe–Ag granular alloys: Origin of the thermal behavior

Badía

Batlle

Labarta

et al. 1997

Journal of Applied Physics

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“…R 0 is the primary part of the ground-state GMR related to elastic scattering by the interfaces, impurities, structural defects, etc., which is assumed to be temperature independent, R P (T) is the influence arising from possible spin-dependent phonon scattering and follows a T law [19], R M (T) denotes the influence coming from electron-magnon scattering which causes spinflip and should yield a negative effect on the GMR. For AFM coupling, R M (T) should follow a T n law, n = 2 in Fe/Cr multilayers [12], n = 1 in single-crystal Co/Cu multilayers [13] and n = 2 in CoCu/Cu multilayers [14]. We fit the R(T) by using a function as R(T) = a + bT − cT n for samples with In thickness t In = 1.05 nm.…”

Section: Resultsmentioning

confidence: 99%

“…in GMR [11]. Temperature dependence of GMR in Fe/Cr multilayers showed that the magnetoresistivity of the AF coupled films decays from its maximum value at low temperature with a T 2 behavior below about 100 K, whereas in the ferromagnetically coupled film this behavior was approximated by T 3/2 , showing the importance of the scattering of conduction electrons due to the magnon excitation [12]. On the other hand, the temperature dependence of the MR was found to behave as T in singlecrystal Co/Cu multilayers [13], and the temperature dependence of the MR was found to behave as T 2 in Co-Cu/Cu multilayers [14].…”

Section: Introductionmentioning

confidence: 93%

Giant magnetoresistance of Fe/In/Fe trilayers

Wang

Chen²,

Zhang

et al. 2009

Journal of Alloys and Compounds

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“…To investigate the electronic transport properties of MMLs not only GMR effect but also temperature dependent electrical resistivity under high pressure is expected to give us useful informations to elucidate the scattering mechanism of conduction electrons in such systems. In particular, for MML system, the additional important contribution from the spin-mixing by electron-magnon collisions to GMR is suggested [6]. In the present work we made an attempt to investigate the temperature dependence of the electrical resistivity of Co/Cu MMLs having a different Cu-layer thickness, under high pressure.…”

mentioning

confidence: 95%