Magnetic dipolar interaction in ultrathin films: Structural and size effects
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| Title: | Magnetic dipolar interaction in ultrathin films: Structural and size effects |
|---|---|
| Authors: | Leon, H. hleon@imre.oc.uh.cu, Estevez-Rams, E.1 |
| Source: | Journal of Magnetism & Magnetic Materials. Jul2009, Vol. 321 Issue 14, p2150-2159. 10p. |
| Subjects: | Dipole moments, Magnetic properties of thin films, Size effects in thin films, Magnetic dipoles, Atomic structure, Layer structure (Solids), Thickness measurement |
| Abstract: | Abstract: A previously introduced formalism for calculating magnetic dipolar anisotropy energy in atomic layered structures is further developed. Numerical results are presented for ultrathin films with different close-packed (face centered cubic (FCC) [111]) and non-close-packed (FCC [001] and body centered cubic (BCC) [001]) structures. Structural effects become apparent in the magnetocrystalline dipolar anisotropy energy when the ratio between the interlayer separation c and the 2D lattice constant a is changed. Despite the long-range character of the dipolar interaction, it is shown that the number of significantly interacting layers, conventially called coupled layers, is limited and depends on the structural aspect ratio . The slope in the observed linear dependence between and the inverse of the film thickness t is explained by the number of the so-called coupled layers, and not by a surface contribution to volume values. Size effects appearing in are unambiguously distinguished from structural effects. Effective anisotropy energy and are presented for Co [0001] and Ni [001] ultrathin films. It is verified that the dipolar interaction makes an important contribution to , but the spin reorientation transition is determined by non-dipolar interactions. The former favors the magnetization switching only when the size aspect ratio , with d the characteristic lateral dimension of the film, is sufficiently small. Applications to other layered arrays of magnetic dipoles are straightforward. [Copyright &y& Elsevier] |
| Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 38911010 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Magnetic dipolar interaction in ultrathin films: Structural and size effects – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Leon%2C+H%2E%22">Leon, H.</searchLink><i> hleon@imre.oc.uh.cu</i><br /><searchLink fieldCode="AR" term="%22Estevez-Rams%2C+E%2E%22">Estevez-Rams, E.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Jul2009, Vol. 321 Issue 14, p2150-2159. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Dipole+moments%22">Dipole moments</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+properties+of+thin+films%22">Magnetic properties of thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Size+effects+in+thin+films%22">Size effects in thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+dipoles%22">Magnetic dipoles</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+structure%22">Atomic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Layer+structure+%28Solids%29%22">Layer structure (Solids)</searchLink><br /><searchLink fieldCode="DE" term="%22Thickness+measurement%22">Thickness measurement</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: A previously introduced formalism for calculating magnetic dipolar anisotropy energy in atomic layered structures is further developed. Numerical results are presented for ultrathin films with different close-packed (face centered cubic (FCC) [111]) and non-close-packed (FCC [001] and body centered cubic (BCC) [001]) structures. Structural effects become apparent in the magnetocrystalline dipolar anisotropy energy when the ratio between the interlayer separation c and the 2D lattice constant a is changed. Despite the long-range character of the dipolar interaction, it is shown that the number of significantly interacting layers, conventially called coupled layers, is limited and depends on the structural aspect ratio . The slope in the observed linear dependence between and the inverse of the film thickness t is explained by the number of the so-called coupled layers, and not by a surface contribution to volume values. Size effects appearing in are unambiguously distinguished from structural effects. Effective anisotropy energy and are presented for Co [0001] and Ni [001] ultrathin films. It is verified that the dipolar interaction makes an important contribution to , but the spin reorientation transition is determined by non-dipolar interactions. The former favors the magnetization switching only when the size aspect ratio , with d the characteristic lateral dimension of the film, is sufficiently small. Applications to other layered arrays of magnetic dipoles are straightforward. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jmmm.2009.01.009 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 2150 Subjects: – SubjectFull: Dipole moments Type: general – SubjectFull: Magnetic properties of thin films Type: general – SubjectFull: Size effects in thin films Type: general – SubjectFull: Magnetic dipoles Type: general – SubjectFull: Atomic structure Type: general – SubjectFull: Layer structure (Solids) Type: general – SubjectFull: Thickness measurement Type: general Titles: – TitleFull: Magnetic dipolar interaction in ultrathin films: Structural and size effects Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Leon, H. – PersonEntity: Name: NameFull: Estevez-Rams, E. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 07 Text: Jul2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 03048853 Numbering: – Type: volume Value: 321 – Type: issue Value: 14 Titles: – TitleFull: Journal of Magnetism & Magnetic Materials Type: main |
| ResultId | 1 |
