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Title: Sputtering growth of Y 3 Fe 5 O 12 /Pt bilayers and spin transfer at Y 3 Fe 5 O 12 /Pt interfaces

Authors:
 [1];  [1];  [2];  [1];  [2];  [1]
  1. Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
  2. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1411107
Grant/Contract Number:
SC0012670
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 5; Journal Issue: 12; Related Information: CHORUS Timestamp: 2017-12-04 10:08:41; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Chang, Houchen, Liu, Tao, Reifsnyder Hickey, Danielle, Janantha, P. A. Praveen, Mkhoyan, K. Andre, and Wu, Mingzhong. Sputtering growth of Y 3 Fe 5 O 12 /Pt bilayers and spin transfer at Y 3 Fe 5 O 12 /Pt interfaces. United States: N. p., 2017. Web. doi:10.1063/1.5013626.
Chang, Houchen, Liu, Tao, Reifsnyder Hickey, Danielle, Janantha, P. A. Praveen, Mkhoyan, K. Andre, & Wu, Mingzhong. Sputtering growth of Y 3 Fe 5 O 12 /Pt bilayers and spin transfer at Y 3 Fe 5 O 12 /Pt interfaces. United States. doi:10.1063/1.5013626.
Chang, Houchen, Liu, Tao, Reifsnyder Hickey, Danielle, Janantha, P. A. Praveen, Mkhoyan, K. Andre, and Wu, Mingzhong. 2017. "Sputtering growth of Y 3 Fe 5 O 12 /Pt bilayers and spin transfer at Y 3 Fe 5 O 12 /Pt interfaces". United States. doi:10.1063/1.5013626.
@article{osti_1411107,
title = {Sputtering growth of Y 3 Fe 5 O 12 /Pt bilayers and spin transfer at Y 3 Fe 5 O 12 /Pt interfaces},
author = {Chang, Houchen and Liu, Tao and Reifsnyder Hickey, Danielle and Janantha, P. A. Praveen and Mkhoyan, K. Andre and Wu, Mingzhong},
abstractNote = {},
doi = {10.1063/1.5013626},
journal = {APL Materials},
number = 12,
volume = 5,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.5013626

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  • Epitaxial PdMn/Fe bilayer structures, in both a-axis PdMn(100)/Fe(001)/MgO(001) and c-axis PdMn(001)/Fe(001)/MgO(001) orientations, were grown by ion-beam sputtering. The a-axis samples were grown at low temperatures (T{lt}280{degree}C) while the c-axis films were stabilized at a higher temperature range (T{gt}300{degree}C). Vibrating sample magnetometry measurements show that the as-grown a-axis samples do not have a measurable exchange bias while c-axis samples have an exchange bias field H{sub e}{similar_to}33Oe. However, annealing at 230{degree}C for 40 min results in a measurable exchange (H{sub e}{similar_to}10Oe) for a-axis samples due to chemical ordering. The possible cause for the difference of H{sub e} in a-axis and c-axis orientationsmore » is also discussed. In addition to the normal structure, inverted structures were obtained epitaxially. The exchange biasing for Fe(001)/PdMn(001)/MgO(001) is as big as 68 Oe. {copyright} 2001 American Institute of Physics.« less
  • The connection between the spin structure of antiferromagnetic NiO and the exchange anisotropy observed in NiO/NiFe bilayers is not well understood. For instance, the NiO bulk-terminated (001) surface is compensated, and therefore simple models predict no exchange bias in (001)-oriented NiFe/NiO bilayers. Using a newly developed ion-beam sputtering (IBS) process to deposit NiO exchange-coupled films, we have simultaneously grown polycrystalline and epitaxial NiO/NiFe bilayers. NiO grown on NiFe/MgO is polycrystalline, while NiO grown directly on MgO is epitaxial. The in-plane orientation of the epilayers was confirmed using (hk0) x-ray diffraction. The exchange anisotropy in epitaxial (001)-oriented bilayers is about halfmore » as large as that observed in polycrystalline bilayers. The size of the exchange anisotropy does not depend on the orientation of the bias field with respect to the in-plane NiFe/NiO crystallographic direction, indicating that the same interfacial spin structure is achieved regardless of the bias field direction. These results show that the surface NiO spin structure is different from that of the bulk, and is uncompensated at the interface independent of the crystalline orientation of the bilayer. Results on epitaxial Co/NiO and NiFe/NiCoO bilayers will also be discussed. {copyright} {ital 1997 American Institute of Physics.}« less
  • The depth profile of the intrinsic magnetic properties in an Fe/Sm-Co bilayer fabricated under nearly optimal spring-magnet conditions was determined by complementary studies of polarized neutron reflectometry and micromagnetic simulations. We found that at the Fe/Sm-Co interface, the magnetic properties change gradually at the length scale of 8 nm. In this intermixed interfacial region, the saturation magnetization and magnetic anisotropy are lower and the exchange stiffness is higher than values estimated from the model based on a mixture of Fe and Sm-Co phases. Therefore, the intermixed interface yields superior exchange coupling between the Fe and Sm-Co layers, but at themore » cost of average magnetization.« less
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  • The phenolbetaine et(30), a well-known internal probe of solvent polarity, is used to characterize the polarity of its environment in micelles, microemulsions, and phospholipid bilayers. The probe molecule, invariably solubilized in the aqueous interface, senses changes in polarity brought about by salt addition and variation of surfactant chain length and concentration, counterion, and temperature. These changes in polarity can be correlated with variations in the micellar aggregation number, signifying that the immediate probe surroundings become less polar when the micelle increases in size. With sodium dodecyl sulfate micelles a discontinuity in the variation of the et(30) value with the aggregationmore » number is observed at 0.45 mole added NaCl, where the shape of the micelles has been reported to undergo a sphere-to-rod transition. The microemulsions behave as swollen micelles. The lowest polarity, comparable to that of 1-butanol, is observed for the phospholipid bilayers. 49 references.« less