Ferromagnetic resonance and magnetic anisotropy of 3-d metal wires with gradients of composition

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Abstract

We discussed experimental results concerning the ferromagnetic resonance spectra characteristics of Co-Ni and Co-Fe-Ni wires arrays with different gradients of composition deposited into porous of track etched polycarbonate membranes. The influence of interfacial boundaries and concentration gradients on the effective field of the investigated wires has been studied. An anomalous angular dependence of the FMR resonance fields is observed for wires arrays with a membrane pore density of ~18%.

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About the authors

E. A. Denisova

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences; Siberian Federal University

Author for correspondence.
Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036; Krasnoyarsk, 660041

L. A. Chekanova

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences

Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036

S. V. Komogortsev

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences; Reshetnev Siberian State University of Science and Technology

Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036; Krasnoyarsk, 660049

R. S. Iskhakov

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences

Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036

I. G. Vazhenina

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences; Siberian Federal University

Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036; Krasnoyarsk, 660041

I. V. Nemtsev

Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences; Siberian Federal University; Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences

Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036; Krasnoyarsk, 660041; Krasnoyarsk, 660036

О. A. Li

Siberian Federal University; Federal Research Center Krasnoyarsk Scientific Centre of the Siberian Branch of the Russian Academy of Sciences

Email: len-den@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660041; Krasnoyarsk, 660036

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2. Fig. 1. SEM images of Co-Ni threads (a); top view of the PCTM with a porosity of 7% (b) and 18% (c); EDX analysis data demonstrating a “step-like” gradient of 1 – Co, 2 – Fe and 3 – Ni content (d) and a “smooth” gradient of 1 – Co and 2 – Ni (d) along the rod axis.

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3. Fig. 2. FMR spectra of coaxial Co@Ni threads for membranes with different pore density: 7% (a) and 18% (b) and Co-Ni threads with a linear gradient of Ni concentration for a membrane with a pore density of 18% (c), measured at different orientations of the longitudinal axis of the thread relative to the external field (1 - the field is applied along the longitudinal axis of the thread, 2 - perpendicular to this axis). The insets show SEM images of the surface of the corresponding PCT membranes with deposited Co@Ni threads.

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4. Fig. 3. Angular dependences of the FMR resonance field for coaxial Co@Ni threads in a PCT membrane with a porosity of 5% (a) and 18% (b) (1 - for the Co core, 2 - Ni shell, 3 - additional peak). Dependences Hr(φ) for homogeneous CoNi threads in a PCT membrane with a porosity of 5% (c) and for gradient CoNi threads in a PCT membrane with a porosity of 18% (d) (1 - for the CoNi alloy, 2 - additional peak). φ = 0 corresponds to the direction of the external field along the longitudinal axis of the threads.

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