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US 2020/0312510 A1Published application
LARGE MOMENTS IN BCC FExCOyMNz AND OTHER ALLOY THIN FILMS
AssigneesMontana State University, The Regents of the University of California
InventorsRyan J. Snow, Yves U. Idzerda, Elke Arenholz
Life of this patent
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Abstract
Large magnetic moment compositions are formed by stabilizing ternary or other alloys with a epitaxial control layer. Compositions that are unstable in bulk specimen are thus stabilized and exhibit magnetic moments that are greater that a Slater-Pauling limit. In one example, FexCoyMnz layers are produced on an MgO(001) substrate with an MgO surface serving to control the structure of the FexCoyMnz layers. Magnetizations greater than 3 Bohr magnetons are produced.
Claims21
A composition, comprising:
- an epitaxially enhanced magnetic layer (EEML) consisting of one or more of Fex1Coy1Mnz1, Fex2Coy2Crz2, Fex3Coy3Vz3, and/or FewCox4Mny4Crz4 or any mixture thereof that exhibits a magnetic moment per atom of at least 1 μB, wherein x1, y1, z1, x2, y2, z2, x3, y3, z3, w, x4, y4, z4 are positive numbers such that x1+y1+z1=1, x2+y2+z2=1, x3+y3+z3=1, and w+x4+y4+z4=1, and μB is a Bohr magneton;
- and
- an epitaxial control layer associated with a composition of the EEML.
A composition, comprising:
- one or more layers of any of Fex1Coy1Mnz1, Fex2Coy2Crz2, Fex3Coy3Vz3, and/or FewCox4Mny4Crz4 or any mixture thereof having a magnetic moment per atom of at least 2.5 μB, wherein x1, y1, z1, x2, y2, z2, x3, y3, z3, w, x4, y4, z4 are positive numbers such that x1+y1+z1=1, x2+y2+z2=1, x3+y3+z3=1, and w+x4+y4+z4=1, and μB is a Bohr magneton;
- and
- an epitaxial control layer adjacent or near the one or more layers.
A method, comprising:
- selecting a composition that includes three or more of Fe, Co, Mn, Cr, V;
- selecting an epitaxial control layer;
- and
- depositing the selected composition on the epitaxial control layer to produce an EEML having a thickness that is less than 100 nm and a magnetic moment per atom of at least 2.0 μB.
1 more element
Dependencies are inferred from the claim text.