Competing anisotropies in holmium-erbium superlattices

J.A. Simpson; D.F. McMorrow; R.A. Cowley; D.A. Jehan; R.C.C. Ward; M.R. Wells; K.N. Clausen

doi:10.1103/PhysRevLett.73.1162

Competing anisotropies in holmium-erbium superlattices

J.A. Simpson, D.F. McMorrow, R.A. Cowley, D.A. Jehan, R.C.C. Ward, M.R. Wells, K.N. Clausen

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Abstract

The effect of competing crystal-field anisotropies on magnetic order has been investigated in a series of Ho/Er superlattices. For temperatures in the interval T(N)(Er) less-than-or-equal-to T less-than-or-equal-to T(N)(Ho) the Ho basal-plane order propagates coherently through the paramagnetic Er with a typical length scale of 1000 angstrom. Below T(N)(Er) the coherence length of the basal-plane order decreases, while the longitudinal component of the Er moments fails to order across the Ho block. It is argued that these results require an extension of current models of indirect exchange in superlattices to explicitly include the superlattice band structure.

Original language	English
Journal	Physical Review Letters
Volume	73
Issue number	8
Pages (from-to)	1162-1165
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.73.1162
Publication status	Published - 1994

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title = "Competing anisotropies in holmium-erbium superlattices",

abstract = "The effect of competing crystal-field anisotropies on magnetic order has been investigated in a series of Ho/Er superlattices. For temperatures in the interval T(N)(Er) less-than-or-equal-to T less-than-or-equal-to T(N)(Ho) the Ho basal-plane order propagates coherently through the paramagnetic Er with a typical length scale of 1000 angstrom. Below T(N)(Er) the coherence length of the basal-plane order decreases, while the longitudinal component of the Er moments fails to order across the Ho block. It is argued that these results require an extension of current models of indirect exchange in superlattices to explicitly include the superlattice band structure. ",

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T1 - Competing anisotropies in holmium-erbium superlattices

AU - Simpson, J.A.

AU - McMorrow, D.F.

AU - Cowley, R.A.

AU - Jehan, D.A.

AU - Ward, R.C.C.

AU - Wells, M.R.

AU - Clausen, K.N.

PY - 1994

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N2 - The effect of competing crystal-field anisotropies on magnetic order has been investigated in a series of Ho/Er superlattices. For temperatures in the interval T(N)(Er) less-than-or-equal-to T less-than-or-equal-to T(N)(Ho) the Ho basal-plane order propagates coherently through the paramagnetic Er with a typical length scale of 1000 angstrom. Below T(N)(Er) the coherence length of the basal-plane order decreases, while the longitudinal component of the Er moments fails to order across the Ho block. It is argued that these results require an extension of current models of indirect exchange in superlattices to explicitly include the superlattice band structure.

AB - The effect of competing crystal-field anisotropies on magnetic order has been investigated in a series of Ho/Er superlattices. For temperatures in the interval T(N)(Er) less-than-or-equal-to T less-than-or-equal-to T(N)(Ho) the Ho basal-plane order propagates coherently through the paramagnetic Er with a typical length scale of 1000 angstrom. Below T(N)(Er) the coherence length of the basal-plane order decreases, while the longitudinal component of the Er moments fails to order across the Ho block. It is argued that these results require an extension of current models of indirect exchange in superlattices to explicitly include the superlattice band structure.

KW - Materialer med særlige fysiske og kemiske egenskaber

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

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Competing anisotropies in holmium-erbium superlattices

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