Structural and magnetic properties of epitaxial Fe 25 Pt 75

Z. Lu; M. J. Walock; P. R. Leclair; G. J. Mankey; P. Mani; D. Lott; F. Klose; H. Ambaye; V. Lauter; M. Wolff; A. Schreyer; H. M. Christen; B. C. Sales

doi:10.1116/1.3143668

Structural and magnetic properties of epitaxial Fe ₂₅ Pt ₇₅

Z. Lu, M. J. Walock, P. R. Leclair, G. J. Mankey, P. Mani, D. Lott, F. Klose, H. Ambaye, V. Lauter, M. Wolff, A. Schreyer, H. M. Christen, B. C. Sales

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Epitaxial films of Fe ₂₅ Pt ₇₅ have a number of different magnetic phases as a function of temperature and chemical order. For example, chemically ordered epitaxial films have two distinct antiferromagnetic phases at temperatures below ∼160 K and exhibit paramagnetism above that temperature. In sharp contrast, chemically disordered epitaxial films are ferromagnetic with a Curie temperature that is greater than 400 K. It is demonstrated that by varying the substrate temperature during growth, epitaxial films with varying degrees of chemical order can be produced and it is possible to produce an alloy with the same composition throughout the film with a modified magnetic structure. The authors used polarized neutron reflectivity to gauge the magnetism of a Fe ₂₅ Pt ₇₅ sample produced with a periodic variation in the growth temperature and showed that the sample exhibits a reduced Curie temperature of approximately 300 K as compared to bulk Fe ₂₅ Pt ₇₅.

Original language	English
Pages (from-to)	770-775
Number of pages	6
Journal	Journal of Vacuum Science and Technology, Part A: Vacuum, Surfaces and Films
Volume	27
Issue number	4
DOIs	https://doi.org/10.1116/1.3143668
State	Published - 2009
Externally published	Yes

Funding

Part of this research was performed at the Spallation Neutron Source, supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, Department of Energy. This research was funded by the NSF Materials Research Science and Engineering Center program through Grant No. NSF-DMR 0213985 and by the DOE/EPSCOR program under Grant No. DE-FG02-08ER46499.

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy	DE-FG02-08ER46499, NSF-DMR 0213985
Basic Energy Sciences

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title = "Structural and magnetic properties of epitaxial Fe 25 Pt 75 ",

abstract = "Epitaxial films of Fe 25 Pt 75 have a number of different magnetic phases as a function of temperature and chemical order. For example, chemically ordered epitaxial films have two distinct antiferromagnetic phases at temperatures below ∼160 K and exhibit paramagnetism above that temperature. In sharp contrast, chemically disordered epitaxial films are ferromagnetic with a Curie temperature that is greater than 400 K. It is demonstrated that by varying the substrate temperature during growth, epitaxial films with varying degrees of chemical order can be produced and it is possible to produce an alloy with the same composition throughout the film with a modified magnetic structure. The authors used polarized neutron reflectivity to gauge the magnetism of a Fe 25 Pt 75 sample produced with a periodic variation in the growth temperature and showed that the sample exhibits a reduced Curie temperature of approximately 300 K as compared to bulk Fe 25 Pt 75.",

author = "Z. Lu and Walock, {M. J.} and Leclair, {P. R.} and Mankey, {G. J.} and P. Mani and D. Lott and F. Klose and H. Ambaye and V. Lauter and M. Wolff and A. Schreyer and Christen, {H. M.} and Sales, {B. C.}",

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TY - JOUR

T1 - Structural and magnetic properties of epitaxial Fe 25 Pt 75

AU - Lu, Z.

AU - Walock, M. J.

AU - Leclair, P. R.

AU - Mankey, G. J.

AU - Mani, P.

AU - Lott, D.

AU - Klose, F.

AU - Ambaye, H.

AU - Lauter, V.

AU - Wolff, M.

AU - Schreyer, A.

AU - Christen, H. M.

AU - Sales, B. C.

PY - 2009

Y1 - 2009

N2 - Epitaxial films of Fe 25 Pt 75 have a number of different magnetic phases as a function of temperature and chemical order. For example, chemically ordered epitaxial films have two distinct antiferromagnetic phases at temperatures below ∼160 K and exhibit paramagnetism above that temperature. In sharp contrast, chemically disordered epitaxial films are ferromagnetic with a Curie temperature that is greater than 400 K. It is demonstrated that by varying the substrate temperature during growth, epitaxial films with varying degrees of chemical order can be produced and it is possible to produce an alloy with the same composition throughout the film with a modified magnetic structure. The authors used polarized neutron reflectivity to gauge the magnetism of a Fe 25 Pt 75 sample produced with a periodic variation in the growth temperature and showed that the sample exhibits a reduced Curie temperature of approximately 300 K as compared to bulk Fe 25 Pt 75.

AB - Epitaxial films of Fe 25 Pt 75 have a number of different magnetic phases as a function of temperature and chemical order. For example, chemically ordered epitaxial films have two distinct antiferromagnetic phases at temperatures below ∼160 K and exhibit paramagnetism above that temperature. In sharp contrast, chemically disordered epitaxial films are ferromagnetic with a Curie temperature that is greater than 400 K. It is demonstrated that by varying the substrate temperature during growth, epitaxial films with varying degrees of chemical order can be produced and it is possible to produce an alloy with the same composition throughout the film with a modified magnetic structure. The authors used polarized neutron reflectivity to gauge the magnetism of a Fe 25 Pt 75 sample produced with a periodic variation in the growth temperature and showed that the sample exhibits a reduced Curie temperature of approximately 300 K as compared to bulk Fe 25 Pt 75.

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ER -

Structural and magnetic properties of epitaxial Fe ₂₅ Pt ₇₅

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