skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effect of ion irradiation on a Co-based amorphous ribbon

Abstract

The effects of ion irradiation on a giant magnetoimpedance (GMI) have been investigated for a Co-based amorphous ribbon with various kinds of ions such as Xe, Ar, and N. The GMI ratio and M-H loop parameters were used to characterize the samples before and after the ion irradiation. The GMI ratio increased considerably in the ion irradiated samples and the GMI response showed a strong dependence on the irradiated ion species and driving frequencies. It was shown that the ion irradiations lead to a substantial modification of the magnetic properties including a large coercivity and shearing of the in-plane magnetization loops, thus suggesting the reduction of an exchange coupling.

Authors:
; ; ; ;  [1];  [2];  [2]
  1. Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600 (Korea, Republic of)
  2. (Korea, Republic of)
Publication Date:
OSTI Identifier:
20982872
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2712025; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ARGON IONS; BORON ALLOYS; COBALT ALLOYS; COERCIVE FORCE; EXCHANGE INTERACTIONS; ION BEAMS; IRON ALLOYS; IRRADIATION; MAGNETIC PROPERTIES; MAGNETIZATION; MAGNETORESISTANCE; METALLIC GLASSES; NITROGEN IONS; SILICON ALLOYS; XENON IONS

Citation Formats

Park, D. G., Kim, C. G., Lee, J. H., Kim, W. W., Hong, J. H., Department of Materials Engineering, Chungnam National University, Daejeon 305-764, and Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600. Effect of ion irradiation on a Co-based amorphous ribbon. United States: N. p., 2007. Web. doi:10.1063/1.2712025.
Park, D. G., Kim, C. G., Lee, J. H., Kim, W. W., Hong, J. H., Department of Materials Engineering, Chungnam National University, Daejeon 305-764, & Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600. Effect of ion irradiation on a Co-based amorphous ribbon. United States. doi:10.1063/1.2712025.
Park, D. G., Kim, C. G., Lee, J. H., Kim, W. W., Hong, J. H., Department of Materials Engineering, Chungnam National University, Daejeon 305-764, and Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600. Tue . "Effect of ion irradiation on a Co-based amorphous ribbon". United States. doi:10.1063/1.2712025.
@article{osti_20982872,
title = {Effect of ion irradiation on a Co-based amorphous ribbon},
author = {Park, D. G. and Kim, C. G. and Lee, J. H. and Kim, W. W. and Hong, J. H. and Department of Materials Engineering, Chungnam National University, Daejeon 305-764 and Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600},
abstractNote = {The effects of ion irradiation on a giant magnetoimpedance (GMI) have been investigated for a Co-based amorphous ribbon with various kinds of ions such as Xe, Ar, and N. The GMI ratio and M-H loop parameters were used to characterize the samples before and after the ion irradiation. The GMI ratio increased considerably in the ion irradiated samples and the GMI response showed a strong dependence on the irradiated ion species and driving frequencies. It was shown that the ion irradiations lead to a substantial modification of the magnetic properties including a large coercivity and shearing of the in-plane magnetization loops, thus suggesting the reduction of an exchange coupling.},
doi = {10.1063/1.2712025},
journal = {Journal of Applied Physics},
number = 9,
volume = 101,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • The Ar ion has been irradiated by an ion implanter with energy of 50, 70, and 100 keV and an ion dosage was set to 1.0x10{sup 17} ion/cm{sup 2} at a beam flux of 3.7 {mu}A/cm{sup 2}. The ion irradiation decreased the initial permeability and increased the relaxation frequency, and the behavior of permeability spectra due to ion irradiation was explained with damped harmonic model of domain wall on the general basis of magnetization mechanism. The ion irradiation gives rise to a significant change on the restoring force of domain wall but minor effect on the spin rotation. The enhancementmore » in the permeability of the amorphous ribbon upon ion irradiation leads to a parallel improvement of giant magneto impedance response of the material, which is of practical use for sensing applications.« less
  • Ultrathin Co-based amorphous ribbons with a thickness of 6--10 ..mu..m were fabricated by a single roller quenching method in vacuum. The compositions of the alloys were zero magnetostrictive: Fe/sub 4.7/Co/sub 70.3/Si/sub 15/B/sub 10/ and (Fe/sub 0.05/Co/sub 0.95/)/sub 71/(Si/sub 0.5/B/sub 0.5/)/sub 29/. The ribbons obtained had good smoothness and dimensional uniformity. The core loss of toroidal samples 15 mm in diameter was measured after annealing. The loss decreased with decreasing ribbon thickness. In the case of 6.4-..mu..m-thick (Fe,Co)/sub 71/(Si,B)/sub 29/ amorphous ribbon, the values at 100 kHz and 1 MHz were 40 mW/cm/sup 3/ and 1.8 W/cm/sup 3/ for B/sub m/more » = 0.1 T, respectively. The former was 1/4 that of Mn-Zn ferrites or 1/2 that of 5-..mu..m-thick Supermalloy tape wound core loss. The latter was (2)/(3) that of 5-..mu..m Supermalloy tape wound core loss. In addition, the initial permeability beyond 100 kHz was also markedly improved by thickness reduction. The values of 6.4-..mu..m-thick (Fe,Co)/sub 71/(Si,B)/sub 29/ ribbon measured at 1 and 10 MHz were about 7000 and 1000 for H/sub m/ = 2 mOe, respectively.« less
  • Changes in various properties with annealing of amorphous alloys have been studied by many researchers. The present work examines the annealing treatment dependence of mechanical relaxation, thermal, and magnetic properties and behaviors in light of microstructure as determined by TEM. The experimental results show that both the onset of embrittlement and the change in DC coercive field with annealing are consistent with microstructural development. An interrelationship among the various experimental measurements and observations is advanced as a unifying construct of the annealing treatment dependence of various properties in Fe/sub 78/B/sub 13/Si/sub 9/ amorphous alloy.
  • Hydrogenated amorphous carbon (a-C:H) thin films were deposited on silicon single crystal substrates from toluene vapor using rf plasma at room temperature. After deposition, the a-C:H films were irradiated with a nitrogen ion beam and effects of nitrogen ion beam irradiation on surface morphology and composition were studied. Nitrogen ion irradiation was performed using nitrogen ion beams of 0.2 and 1.5 keV for 10 min under the constant ion current density at room temperature. Surface morphology was observed by atomic force microscopy (AFM). Changes in composition and carbon-nitrogen bonding states were analyzed by x-ray photoelectron spectroscopy (XPS). Carbon structures weremore » examined by Raman spectroscopy. AFM observations revealed that the film surface became smooth after nitrogen ion beam irradiation and a notable difference in surface roughness is hardly observed between 0.2 and 1.5 keV ion irradiation. XPS studies showed that nitrogen was implanted near the surface of the a-C:H films after nitrogen ion irradiation and combined with carbon, resulting in carbon nitride formation. Depth profiles obtained by XPS showed that nitrogen ions were implanted in the a-C:H films more deeply after 1.5 keV ion irradiation than 0.2 keV ion irradiation. The implanted nitrogen ion behavior inside the films has been clarified, which is useful to judge the effectiveness for the formation of carbon nitride layers. Carbon structures did not change remarkably after nitrogen ion irradiation except the surface region, where carbon nitride layers are formed.« less