Giant magnetoresistance of perpendicular magnetic Co/Au multilayers

Honda, Shinya; Fujimoto, Tatsuya; Nawate, M.

doi:10.1063/1.363501

Cited by 23 publications

(20 citation statements)

References 18 publications

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“…Many novel nanomaterials have been developed from the combination of ferromagnetic 3-d transition metals and non-magnetic group IB metals at an atomic scale [6], [14]- [20], and more are expected to emerge as the research continues. Usually, 3-d transition ferromagnetic metals exhibit MR effect by virtue of their nature as these materials possess interesting electronic configurations where the 4s sub-shells are occupied leaving behind their 3-d shells unfilled.…”

Section: Introductionmentioning

confidence: 99%

Magnetotransport Properties of Co-Au Granular Alloys

Rizal¹,

Ueda²,

Pokharel³

2011

IJAPM

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Abstract-A series of Cox-Au1-x granular alloys was grown using pulsed-current electrodeposition on polyimide substrates. The relationship between the giant magnetoresistance effect, saturation magnetization, and grain size was examined as the deposition current density and annealing temperatures were changed. A maximum magnetoresistance (MR) ratio of 4.5 % was obtained. The magnetization and ferromagnetic grain size of the as-deposited and annealed alloy films were examined against the deposition current density. The saturation magnetization decreased as the composition of Au was increased for both the alloys deposited at the current densities of 1 and 5 mA/cm2. The total magnetic moment further decreased on annealing. The grain size is found to be highly influenced by both the deposition current density and temperature. A low temperature magnetization measurement suggested that the ferromagnetic grain size decreases with increase in current densities. For the annealed samples, the ferromagnetic grain sizes were found to be dispersed in the Au matrix with different diameters. The decrease in magnetic moments with annealing is correlated with the grain size of the Co and its distribution in the gold matrix. The MR ratio increased with the increase in the deposition current density as a result of the formation of smaller grain size at higher deposition current densities.

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Section: Introductionmentioning

confidence: 99%

Magnetotransport Properties of Co-Au Granular Alloys

Rizal¹,

Ueda²,

Pokharel³

2011

IJAPM

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“…Additional information on the relative orientation of the magnetic moments of the neighboring layers can be obtained from the magnetoresistance measurements. (The Co/Au MLs display a giant magnetoresistance (GMR) [9], i.e., the resistance is proportional to a cosine of the angle between the magnetic moments of the neighboring layers [10].) Figure 2 shows the R(H) dependences of the ML presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Selective Modification of Magnetic Properties of Co₁/Au/Co₂/Au Multilayers by He Ion Bombardment

et al. 2009

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We show that in a [Co1/Au/Co2/Au]4 multilayer, where Co 1(2) denote Co layers of different thicknesses, a 10 keV He-ion bombardment with a 6 × 10 14 ions cm −2 dose leads to changes of the easy direction from out-of-plane to in-plane in the thicker Co layers (tCo2 = 1 nm) while the perpendicular anisotropy of the thinner Co layers (tCo1 = 0.6 nm) is preserved. The investigated multilayers were obtained by sputtering and the thickness of the Au layers (tAu = 4 nm) ensured that a direct coupling between the Co layers (through pinholes) and Ruderman-Kittel-Kasuya-Yosida-like interactions were negligible.

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“…The wall energy density is the same order as that for the Co/Au MLs. 15 This stripe domain pattern implies that the magnetic moment is slightly canted from the perpendicular axis.…”

Section: A Magnetic Propertiesmentioning

confidence: 95%

“…[8][9][10][11] Furthermore, the 197 Au and 57 Fe Mössbauer measurements have been performed by several authors to clarify the electronic states of Au and Fe in the Au/Fe MLs. [12][13][14] We have recently reported that Co/Au MLs exhibit stripe domains arising from the perpendicular magnetic anisotropy and they show large giant magnetoresistance, which consists of two components: 15 one is the hysteretic component related to the magnetic wall motion and the other is the granulartype GMR. 16 Similar phenomena have also been observed in Fe/Au MLs.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and giant magnetoresistance of Fe/Au multilayers

Honda

Koguma

Nawate

et al. 1997

Journal of Applied Physics

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Magnetic properties and magnetoresistance (MR) are examined for the Fe/Au multilayers (MLs) prepared on glass substrates by electron-beam evaporation techniques as a function of the thicknesses of Fe and Au layers; dFe and dAu. For small dFe, the perpendicular magnetic anisotropy is induced, and in the films of dFe≈5 Å, the stripe magnetic domain patterns are observed. In dFe⩽3 Å, however, a superparamagnetic nature and a granular-type giant magnetoresistance (GMR) appear at room temperature. In a series of [Fe(3 Å)/Au(dAu)]40 MLs, the MR ratio increases with dAu and reaches the first peak at around 10 Å. On the other hand, at 14 K, the ferromagnetic component having a perpendicular anisotropy becomes dominant, and the GMR arises from the random wall alignment due to the antiferromagnetic coupling between the adjacent Fe layers, causing the first MR peak at dAu≈10 Å. The layered structure is obscured and the superparamagnetic Fe grains are created by annealing at 300–350 °C, followed by the crystalline growth upon annealing at temperatures above 350 °C. These variations in the film morphology cause the changes in the saturation magnetization and the MR ratio.

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Giant magnetoresistance of perpendicular magnetic Co/Au multilayers

Cited by 23 publications

References 18 publications

Magnetotransport Properties of Co-Au Granular Alloys

Magnetotransport Properties of Co-Au Granular Alloys

Selective Modification of Magnetic Properties of Co₁/Au/Co₂/Au Multilayers by He Ion Bombardment

Magnetic properties and giant magnetoresistance of Fe/Au multilayers

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Giant magnetoresistance of perpendicular magnetic Co/Au multilayers

Cited by 23 publications

References 18 publications

Magnetotransport Properties of Co-Au Granular Alloys

Magnetotransport Properties of Co-Au Granular Alloys

Selective Modification of Magnetic Properties of Co1/Au/Co2/Au Multilayers by He Ion Bombardment

Magnetic properties and giant magnetoresistance of Fe/Au multilayers

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Selective Modification of Magnetic Properties of Co₁/Au/Co₂/Au Multilayers by He Ion Bombardment