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Tomitaka A, Ota S, Nishimoto K, Arami H, Takemura Y, Nair M. Dynamic magnetic characterization and magnetic particle imaging enhancement of magnetic-gold core-shell nanoparticles. NANOSCALE 2019; 11:6489-6496. [PMID: 30892348 PMCID: PMC6464385 DOI: 10.1039/c9nr00242a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Multifunctional nanoparticles with a magnetic core and gold shell structures are emerging multi-modal imaging probes for disease diagnosis, image-guided therapy, and theranostic applications. Owing to their multi-functional magnetic and plasmonic properties, these nanoparticles can be used as contrast agents in multiple complementary imaging modalities. Magnetic particle imaging (MPI) is a new pre-clinical imaging system that enables real-time imaging with high sensitivity and spatial resolution by detecting the dynamic responses of nanoparticle tracers. In this study, we evaluated the dynamic magnetic properties and MPI imaging performances of core-shell nanoparticles with a magnetic core coated with a gold shell. A change in AC hysteresis loops was detected before and after the formation of the gold shell on magnetic core nanoparticles, suggesting the influence of the core-shell interfacial effect on their dynamic magnetic properties. This alteration in the dynamic responses resulted in an enhancement of the MPI imaging capacity of magnetic nanoparticles. The gold shell coating also enabled a simple and effective functionalization of the nanoparticles with a brain glioma targeting ligand. The enhanced MPI imaging capacity and effective functionality suggest the potential application of the magnetic-gold core-shell nanoparticles for MPI disease diagnostics.
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Affiliation(s)
- Asahi Tomitaka
- Department of Immunology and Nano-Medicine, Institute of NeuroImmune Pharmacology, Centre for Personalized Nanomedicine, Herbert Wertheim College of Medicine, Florida International University, Miami, Florida 33199, USA.
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Ren Y, Li X, Wang Y, Ren J, Zhang Y, Dai B, Yan H, Sun G, Peng S. Patterned FeNi soft magnetic strips film with tunable resonance frequency from 1 to 10.6 GHz. Sci Rep 2016; 6:31773. [PMID: 27561328 PMCID: PMC4999886 DOI: 10.1038/srep31773] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 07/15/2016] [Indexed: 11/18/2022] Open
Abstract
Soft magnetic films with a wide-range tunable ferromagnetic resonance frequency are suitable for miniaturization and multifunctionalization of microwave integrated circuits. Fabrication of these films for high-frequency applications is usually complicated and difficult. We demonstrate a simple method to fabricate patterned FeNi soft magnetic strip films by magnetron sputtering and photolithography. Films prepared by this method exhibits a tunable in-plane uniaxial magnetic anisotropy (IPUMA) for different strip widths and gaps. As the strip widths changing from 500 to 2 μm, the IPUMA field increases monotonically from 2.2 to 576 Oe and resonance frequency from 1 to 10.6 GHz(which covers four microwave bands, including the L,S,C and X bands) respectively. This ultra-wide-range adjustability of resonance frequency can be attributed to shape anisotropy of strips. Considering that FeNi alloy has relatively low magnetocrystalline anisotropy, so a wider adjustable range of resonance frequency could be obtained using materials with stronger magnetocrystalline anisotropy.
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Affiliation(s)
- Yong Ren
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China.,State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Xinxi Li
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China
| | - Yan Wang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China
| | - Jiankun Ren
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China
| | - Yan Zhang
- State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Bo Dai
- State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Haiyang Yan
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China
| | - Guangai Sun
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China
| | - Shuming Peng
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621999, People's Republic of China
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He S, Meng Z, Huang L, Yap LK, Zhou T, Panagopoulos C. A versatile rotary-stage high frequency probe station for studying magnetic films and devices. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:074704. [PMID: 27475578 DOI: 10.1063/1.4958036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Abstract
We present a rotary-stage microwave probe station suitable for magnetic films and spintronic devices. Two stages, one for field rotation from parallel to perpendicular to the sample plane (out-of-plane) and the other intended for field rotation within the sample plane (in-plane) have been designed. The sample probes and micro-positioners are rotated simultaneously with the stages, which allows the field orientation to cover θ from 0(∘) to 90(∘) and φ from 0(∘) to 360(∘). θ and φ being the angle between the direction of current flow and field in a out-of-plane and an in-plane rotation, respectively. The operation frequency is up to 40 GHz and the magnetic field up to 1 T. The sample holder vision system and probe assembly are compactly designed for the probes to land on a wafer with diameter up to 3 cm. Using homemade multi-pin probes and commercially available high frequency probes, several applications including 4-probe DC measurements, the determination of domain wall velocity, and spin transfer torque ferromagnetic resonance are demonstrated.
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Affiliation(s)
- Shikun He
- Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-01, Innovis 138634, Singapore
| | - Zhaoliang Meng
- Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-01, Innovis 138634, Singapore
| | - Lisen Huang
- Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-01, Innovis 138634, Singapore
| | - Lee Koon Yap
- Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-01, Innovis 138634, Singapore
| | - Tiejun Zhou
- Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-01, Innovis 138634, Singapore
| | - Christos Panagopoulos
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
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