1. University of Kentucky
UKnowledge
Physics and Astronomy Faculty Patents Physics and Astronomy
1-22-2013
Class of Ferromagnetic Semiconductors
Larysa Shlyk
University of Kentucky
Sergiy A. Kryukov
University of Kentucky, kryukoff@gmail.com
Lance E. De Long
University of Kentucky, delong@pa.uky.edu
Barbara Schüpp-Niewa
Rainer Niewa
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Recommended Citation
Shlyk, Larysa; Kryukov, Sergiy A.; De Long, Lance E.; Schüpp-Niewa, Barbara; and Niewa, Rainer, "Class of Ferromagnetic
Semiconductors" (2013). Physics and Astronomy Faculty Patents. Paper 2.
http://uknowledge.uky.edu/physastron_patents/2
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 ofthis
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 ofRu ferrites:
BaMRuSo ll (MILi and Cu) and BaM‘2ru4o ll (M‘IMn, Fe andCo”,
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?O11
(MIFe, Co), Journal ofApplied Physics 103, 07Dl, 12 (2008).
F00, M.L., et a1., “Synthesis, structure and physical properties ofRu
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)Oll (1 g
(x+y)§5; 022; 1) and (Ba,Sr)M2?Ru4IKO, 1 (M:Fe,Co)
belong to a novel class offerromagnetic semiconductors With
applications in spin-based ?eld effect transistors, spin-based
light emitting diodes, andmagnetic random access memories.
15 Claims, 18 Drawing Sheets
3. 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_616pm and Ba
Co1_85(6)Ru4_15(6)O11, Preparation Crystal Structures, and Magnetic
and Transport Properties ofQuaternary Transition Metal OXoruthen
ates, Z. Naturforsch, 62b, Jun. 2007, pp. 753-758.
* cited by examiner
