Skip to main content Accessibility help
×
Home
Hostname: page-component-78bd46657c-2pqp7 Total loading time: 0.297 Render date: 2021-05-07T10:07:03.074Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": false, "newCiteModal": false, "newCitedByModal": true }

Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes

Published online by Cambridge University Press:  21 March 2011

M. Kröll
Affiliation:
Physics Department, Trinity College Dublin, Dublin 2, Ireland
L. J. de Jongh
Affiliation:
Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands
F. Luis
Affiliation:
Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands
P. Paulus
Affiliation:
Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands
G. Schmid
Affiliation:
Institut für Anorganische Chemie, Universität GH Essen, Universitätsstr. 5-7, 45117 Essen, Germany
Get access

Abstract

The magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires is studied at low temperatures. All nanowires show a strong shape anisotropy with the easy axis being parallel to the long axis of the wires. Co nanowires additionally show a temperature dependent magnetocrystalline anisotropy along the hexagonal c-axis, which is directed nearly perpendicular to the long axis of the wires, as is confirmed by X-Ray diffraction measurements [1] and reported by Strijkers et al. who performed NMR measurements on samples prepared in a similar way [2]. Therefore, at low temperatures and for large wire diameters a competition between magnetocrystalline and shape anisotropies can be observed. Co wires with a small diameter, however, do not show a significant magnetocrystalline anisotropy. Fcc-Co, which is only known as a high-temperature Co modification and which does not have a large magnetocrystalline anisotropy constant, becomes the predominant Co modification here [1,3]. Investigations on the size dependence of the switching field for Fe and Ni nanowires provide information about the magnetization reversal process, which takes place via a nucleation of small magnetic domains probably at the end of the wires, and subsequent propagation of the domain wall along the wire.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below.

References

1 Benfield, R. E., Grandjean, D., Dore, J. C., Wu, Z., Kröll, M., Sawitowski, T. and Schmid, G., Structure of metal nanowires in nanoporous alumina membranes studied by X-ray diffraction, (2001) (in press)CrossRefGoogle Scholar
2 Strijkers, G. J., Dalderop, J. H. J., Broeksteeg, M. A. A., Swagten, H. J. M. and Jonge, W. J. M. de, Structure and magnetization of arrays of electrodeposited Co wires in anodic alumina, J. Appl. Phys. 86 (9), 51415145 (1999)10.1063/1.371490CrossRefGoogle Scholar
3 Paulus, P. M., Luis, F., Kröll, M., Schmid, G. and Jongh, L. J. de, Low temperature study of the reversal mode and the magnetic anisotropy of Fe, Ni and Co wires in alumite, J. Magn. Magn. Mater. 224, 180196 (2001)CrossRefGoogle Scholar
4 Ozin, G. A., Nanochemistry: Synthesis in Diminishing Dimensions, Adv. Mater. 4 (10), 612649 (1992)CrossRefGoogle Scholar
5 Bowles, C. L. and Ozin, G. A., Self-Assembling Frameworks: Beyond Microporous Oxides, Adv. Mater. 8 (1), 13 (1996)CrossRefGoogle Scholar
6 Routkevitch, D., Tager, A. A., Haruyama, J., AlMawlawi, D., Moskovits, M., Xu, J. M., Nonlithographic Nano-Wire Arrays: Fabrication, Physics, and Device Application, IEEE T. Electron. Dev. 43 (10), 16461658 (1996)CrossRefGoogle Scholar
7 Frei, E. H., Shtrikman, S. and Treves, D., Critical Size and Nucleation Field of Ideal Ferromagnetic Particles, Phys. Rev. 106, 446455 (1957)10.1103/PhysRev.106.446CrossRefGoogle Scholar
8 Aharoni, A., Shtrikman, S., Magnetization Curve of the Infinite Cylinder, Phys. Rev. 109, 15221528 (1958)CrossRefGoogle Scholar
9 Braun, H.-B., Thermally Activated Magnetization Reversal in Elongated Ferromagnetic Particles Phys. Rev. Lett. 71, 35573560 (1993)10.1103/PhysRevLett.71.3557CrossRefGoogle ScholarPubMed
10 Knowles, J. E., Magnetization Reversal by Flipping, in Acicular Particles of γ-Fe2O3 , J. Magn. Magn. Mater. 61, 121128 (1986)10.1016/0304-8853(86)90074-0CrossRefGoogle Scholar
11 Huysmans, G. T. A., Lodder, J. C. and Wakui, J., Magnetization curling in perpendicular iron particle arrays (alumite media), J. Appl. Phys. 64, 2016 (1988)CrossRefGoogle Scholar

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *