2014Journal of Applied PhysicsRequires access

Magnetization switching detection of a single permalloy nanomagnet using magneto-transport measurements

V. D. Nguyen, P. Laczkowski, A. Marty, L. Notin, C. Beigné, L. Vila, Jean‐Philippe Attané

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Abstract

The magnetoresistance of Permalloy (NiFe) nanomagnets is studied at room temperature. For low aspect ratios, the main contribution is the anisotropic magnetoresistance, whereas for higher aspect ratio this contribution vanishes. We show that magnon magnetoresistance measurements need to be taken into account to detect precisely the magnetization switching of a single NiFe nanomagnet of dimensions 200 × 32 × 30 nm3. Experimental results are found to be in agreement with micromagnetic simulations and we give the analytical expressions to compute this effect. The measurement of the angular dependence on the magnetization switching allows studying the magnetization reversal mode of a single nanomagnet.

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What this paper is about

The magnetoresistance of Permalloy (NiFe) nanomagnets is studied at room temperature. For low aspect ratios, the main contribution is the anisotropic magnetoresistance, whereas for higher aspect ratio this contribution vanishes. We show that magnon magnetoresistance measurements need to be taken into account to detect precisely the magnetization switching of a single NiFe nanomagnet of dimensions 200 × 32 × 30 nm3. Experimental results are found to be in agreement with micromagnetic simulations and we give the analytical expressions to compute this effect. The measurement of the angular dependence on the magnetization switching allows studying the magnetization reversal mode of a single nanomagnet.

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Available abstract

The magnetoresistance of Permalloy (NiFe) nanomagnets is studied at room temperature. For low aspect ratios, the main contribution is the anisotropic magnetoresistance, whereas for higher aspect ratio this contribution vanishes. We show that magnon magnetoresistance measurements need to be taken into account to detect precisely the magnetization switching of a single NiFe nanomagnet of dimensions 200 × 32 × 30 nm3. Experimental results are found to be in agreement with micromagnetic simulations and we give the analytical expressions to compute this effect. The measurement of the angular dependence on the magnetization switching allows studying the magnetization reversal mode of a single nanomagnet.

Key concepts: Nanomagnet, Permalloy, Magnetization, Condensed matter physics, Magnetoresistance, Micromagnetics, Materials science, Anisotropy

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