Class of Ferromagnetic Semiconductors

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, kryukoff@gmail.com

Lance E. De LongUniversity of Kentucky, delong@pa.uky.edu

Barbara Schüpp-Niewa

Rainer Niewa

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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

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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

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