Magnetotransport through magnetic domain patterns in permalloy rectangles

Bolte, Markus; Steiner, M.; Pels, C.; Barthelmeß, Miriam; Kruse, J.; Merkt, U.; Meier, Guido; Holz, Matthias; Pfannkuche, Daniela

doi:10.1103/physrevb.72.224436

Cited by 19 publications

(10 citation statements)

References 43 publications

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“…Unlike in anisotropic magnetoresistance measurements, no contact lines are required which may act as pinning sites for DWs and thus may affect depinning experiments. 14 Controlled pinning and depinning of DWs at constrictions in nanowires are key issues for applications based on the motion and detection of individual walls such as the magnetic race-track memory 15 and logic devices. 16 It has been shown that the field strength required for depinning a DW from a constriction depends on the depth of the constriction [17][18][19][20] as well as on the type of DW that has been pinned.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of domain-wall depinning fields in constricted Permalloy nanowires

Lendecke

Eiselt

Meier

et al. 2008

Journal of Applied Physics

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We use ballistic Hall micromagnetometry to determine depinning fields of domain walls (DWs) in Permalloy nanowires in the temperature range between 5 and 50K. The walls are pinned in constrictions defined by a triangularly shaped notch on one side of the wire. The high sensitivity of the Hall sensor to local stray fields allows the detection of individual DWs and a distinction of different wall types. A strong temperature dependence of the depinning fields is observed that can be described by a model with a single energy barrier. For temperatures above 20K, additional types of DWs occur.

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Section: Introductionmentioning

confidence: 99%

Temperature dependence of domain-wall depinning fields in constricted Permalloy nanowires

Lendecke

Eiselt

Meier

et al. 2008

Journal of Applied Physics

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“…Furthermore the curvatureinduced radial anisotropy distribution and the complexity of possible current paths lead to contributions from anisotropic MR, which are hard to evaluate. 30 For this purpose, sophisticated micromagnetic simulations are required, which lie beyond the scope of this work.…”

Section: Resultsmentioning

confidence: 99%

Magnetoresistive effects in Co/Pd multilayers on self-assembled nanoparticles (invited)

Moser¹,

Kunej²,

Pernau³

et al. 2010

Journal of Applied Physics

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The deposition of Co/Pd multilayers onto self-assembled spherical particles provides a system with unique magnetic properties. The magnetic caps have high perpendicular magnetic anisotropy, are single-domain, and strongly exchange decoupled, but in electrical contact with each other, thus enabling magnetotransport measurements. By applying an external magnetic field, the caps can be switched individually. We systematically studied the magnetoresistance on a two-dimensional cap array consisting of Co/Pd multilayers deposited on particles with a diameter of 200 nm. In the vicinity of the coercive field, a hysteretic resistance peak occurs. It can be explained with the random magnetization configuration of the magnetic caps leading to an increased spin-dependent scattering of the conduction electrons. The underlying mechanism might be comparable to the one causing giant magnetoresistance in granular alloys. For temperatures above 77 K, additional resistivity contributions with high saturation fields are observed, which are tentatively explained by the decreasing size of magnetically ordered parts of the caps with increasing temperature, resulting finally in superparamagnetic behavior in the contact area between neighboring caps.

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“…Different magnetization orientations of the domains cause locally varying current densities, which have to be taken into account. Nevertheless, it has been shown that a uniform electrical current density is a good approximation in microstructures, 33 as the AMR ratio is only a few percent. Using this assumption the resistance contribution of the individual domains depends only on the area filling and magnetization orientation.…”

Section: B Hard-axis Magnetization Behaviormentioning

confidence: 98%

Magnetic energies of single submicron permalloy rectangles determined via magnetotransport

et al. 2009

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We have investigated the magnetic properties of single submicron permalloy rectangles with a thickness of 20 nm and an aspect ratio of 2:1 via anisotropic magnetoresistance ͑AMR͒. Preparation and investigation via magnetotransport are performed in situ in ultrahigh vacuum. The field-dependent magnetization behavior of the two generic cases with the magnetic field applied perpendicular and parallel to the long axis of the rectangles is studied. Due to the high sensitivity of our setup, single field sweeps are sufficient to obtain magnetoresistance curves of structures with dimensions as small as 600ϫ 300 nm 2 . To link features of the AMR to changes in the micromagnetic states, the remanent state has been investigated via scanning electron microscopy with polarization analysis. Our main result is that the energy density of micromagnetic states can be obtained from the hard-axis magnetization behavior. It is demonstrated that a C/S state can be distinguished from a Landau state and the energy difference between both states is determined.

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Magnetotransport through magnetic domain patterns in permalloy rectangles

Cited by 19 publications

References 43 publications

Temperature dependence of domain-wall depinning fields in constricted Permalloy nanowires

Temperature dependence of domain-wall depinning fields in constricted Permalloy nanowires

Magnetoresistive effects in Co/Pd multilayers on self-assembled nanoparticles (invited)

Magnetic energies of single submicron permalloy rectangles determined via magnetotransport

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