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University of KentuckyUKnowledge
Physics and Astronomy Faculty Patents Physics and Astronomy
1-22-2013
Class of Ferromagnetic SemiconductorsLarysa ShlykUniversity of Kentucky
Sergiy A. KryukovUniversity of Kentucky, [email protected]
Lance E. De LongUniversity of Kentucky, [email protected]
Barbara Schüpp-Niewa
Rainer Niewa
Follow this and additional works at: http://uknowledge.uky.edu/physastron_patents
Part of the Astrophysics and Astronomy Commons, and the Physics Commons
This Patent is brought to you for free and open access by the Physics and Astronomy at UKnowledge. It has been accepted for inclusion in Physics andAstronomy Faculty Patents by an authorized administrator of UKnowledge. For more information, please contact [email protected].
Recommended CitationShlyk, Larysa; Kryukov, Sergiy A.; De Long, Lance E.; Schüpp-Niewa, Barbara; and Niewa, Rainer, "Class of FerromagneticSemiconductors" (2013). Physics and Astronomy Faculty Patents. Paper 2.http://uknowledge.uky.edu/physastron_patents/2
(12) United States Patent Shlyk et al.
US008357309B2
US 8,357,309 B2 Jan. 22, 2013
(10) Patent N0.: (45) Date of Patent:
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CLASS OF FERROMAGNETIC SEMICONDUCTORS
Inventors: Larysa Shlyk, Lexington, KY (US); Sergly Alexandrovich Kryukov, Lexington, KY (US); Lance Eric De Long, Lexington, KY (US); Barbara Schiipp-NieWa, Hallbergmoos (DE); Rainer NieWa, Hallbergmoos (DE)
Assignee: University of Kentucky Research Foundation, Lexington, KY (US)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 760 days.
Appl. No.: 12/062,076
Filed: Apr. 3, 2008
Prior Publication Data
US 2008/0277748 A1 Nov. 13, 2008
Related US. Application Data
Provisional application No. 60/921,641, ?led on Apr. 3, 2007.
Int. Cl. C01G 55/00 (2006.01) C01G 23/00 (2006.01) C01G 23/04 (2006.01) US. Cl. ....... .. 252/62.62; 252/6251 R; 252/62.3 R;
117/944; 257/421; 423/593.1; 423/5946; 423/594.2; 423/598; 423/594.9; 423/594.16
Field of Classi?cation Search ............. .. 252/62.62,
252/6251 R, 62.3 R; 423/593.1, 594.6, 594.2, 423/598, 594.9, 594.16; 117/944; 257/421
See application ?le for complete search history.
(56) References Cited
PUBLICATIONS
Verdoes et a1, “Equilbria Description for the System BaO-RuO2 Fe203 with less than 55 mol%BaO at 1300C in Platinum Capsules: A Crystallographic and Leaching Study”, Mat. Res. Bull. vol. 22, pp. 1-10, 1987* Martinez et a1, “Magnetic Behavior of the BaFe4-2xSn2-xCoxOll System: From Cluster Glass to Kagome Phase”, Phy. Rev. B, vol. 48, No.22, Dec. 1, 1993, pp. 16440-16448.* Thompson et a1, “Structure-property Relationships in te R-type hexaferrites: Cation distribution and magnetic susceptibilites of MX2Fe40l l”, Hyper?ne Interactions, 94(1994), pp. 2039-2044.* Sosnowska et a1, “Neutron diffraction studies of the Fe3+ magnetic moments arragngements in the spun-glass systems BaTi2Fe40ll and BaSn2Fe4011”, Physica B, 234-236, (1997), pp, 934-936.* PrZeniosla et a1, “Determination of the Fe/Sn atoms distribution in BaSn2Fe40ll by neutron and synchrotron radiation diffraction”, Physica B 234-236, (1997), pp. 931-933.* Foo et a1, “Synthesis, Structure and physical propeties of Ru ferrites: BaMRuSo ll (MILi and Cu) and BaM‘2ru4o ll (M‘IMn, Fe and Co”, Journ. Solid State Chem. 179, Dec. 19, 2005, pp. 563-572.* Shlyk, L., et a1., Structural, magnetic, and transport properties of a novel class of ferromagnetic semiconductors: SrM2?Ru4?O 11 (MIFe, Co), Journal ofApplied Physics 103, 07Dl, 12 (2008). F00, M.L., et a1., “Synthesis, structure and physical properties of Ru ferrites: Ba/M2Ru5Oll (MILi and Cu) and Ball/fzRultOll (M‘IMn, Fe and Co)”, Journal of Solid State Chemistry 179 (2006) 563-572.
(Continued)
Primary Examiner * Carol M KosloW
(74) Attorney, Agent, or Firm * CroWell & Moring LLP
(57) ABSTRACT
Single crystal and polycrystal oxoruthenates having the gen eraliZed compositions (BaZ,Srl_Z)FexCoyRu6_(x+y)Ol l (1 g (x+y)§5; 022; 1) and (Ba,Sr)M2?Ru4 IKO, 1 (M:Fe,Co) belong to a novel class of ferromagnetic semiconductors With applications in spin-based ?eld effect transistors, spin-based light emitting diodes, and magnetic random access memories.
15 Claims, 18 Drawing Sheets
US 8,357,309 B2 Page 2
PUBLICATIONS
Verdoes, D., et al., “Equilibria Description for the System BaO RuO2-Fe2O3 With Less Than 55 Mol% BaO at l300° C. in Platinum Capsules; A Crystallographic and Leaching Study,” 1987 Pergamon Journals Ltd., Mat. Res. Bull., vol. 22, pp. l-lO. Larysa Shlyk et al., High-Temperature Ferromagnetism and Tunable Seminconductivity of (Ba, Sr)M2?Ru4?Oll (MIFe, Co): A New
Paradigm for Spintronics, Advanced Materials, published online Mar. 18, 2008, 9999, pp. 1-6. Barbar Schupp-NieWa et al., BAFe3_39(5)Ru2_6 16pm and Ba Co1_85(6)Ru4_15(6)O11, Preparation Crystal Structures, and Magnetic and Transport Properties of Quaternary Transition Metal OXoruthen ates, Z. Naturforsch, 62b, Jun. 2007, pp. 753-758.
* cited by examiner
US. Patent Jan. 22, 2013 Sheet 1 0f 18 US 8,357,309 B2
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