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Dissertation-Yu Lu-V10.pdf (3.52 MB)

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DEVELOPMENT OF NEW OGANIC-BASED MAGMENTS FOR SPINTRONICS

Lu, Yu
http://rave.ohiolink.edu/etdc/view?acc_num=osu1440153101

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Chemistry.
Organic-based magnets are an emerging research area. The chemical tailorability, all benefits of organic materials as well as potential use in organic spintronics make them an important supplement to traditional metal/metal oxide magnets. This dissertation focused on development of new organic-based magnets, which is composed of three parts. In the first part, a new high Curie temperature (Tc ~ 145 K) organic-based magnet with composition of vanadium ethyl tricyanoethlyenecarboxylate (V[ETCEC]1.3•0.3 CH2Cl2) is prepared via a reaction of V(CO)6 and ETCEC in CH2Cl2. Temperature-, field-, and frequency-dependent measurements of the magnetization reveal complex magnetic behavior with a magnetic transition into a more disordered state. Since ethyl tricyanoethlyenecarboxylate (ETCEC) holds the structure similarity with tetracyanoethylene (TCNE) and methyl tricyanoethylenecarboxylate (MeTCEC), the comparison is made among these materials, which indicates the effects of steric hindrance and electron negativity on magnetic properties. Application of the random anisotropy model (RMA) shows that this disordered state is different from the correlated spin glass (CSG) phase observed in analogous organic-based magnets V[MeTCEC]x and V[TCNE]x synthesized in CH2Cl2. This suggests that V[ETCEC]x is less disordered than its analogues, which can be attributed to the slower reaction rate. In the second part, I will present the first successful attempt at ligand modification in chemical vapor deposition (CVD) prepared thin film by replacing a single cyano group on TCNE with an ester on ETCEC and MeTCEC. The resulting films have magnetic ordering temperature of ~175 K and ~300 K respectively, providing the first viable complement to V[TCNE]2 and opening the door to an entire class of all-organic magnetic heterostructures. These heterostructures will retain the central benefits demonstrated in other areas of organic electronics such as low cost, low deposition temperature and conformal deposition, while incorporating key magnetic based functionality such as non-volatile memory, magnetic sensing and applications in high frequency magnetoelectronics. The structures, magnetic and electronic properties of these materials are characterized by a combination of various instruments. The last part of this dissertation will focus on the progress that have been made during my PhD study toward the application of organic-based magnets, including encapsulation of these materials to protect them from degradation, optimization of growth conditions to achieve high quality films with super-narrow ferromagentic resonance (FMR) signal (~1 G) and application of thin film V[TCNE]x as a spin injector/detector in spin-valves.
Ezekiel Johnston-Halperin (Advisor)
Turro Turro (Committee Member)
Psaras McGrier (Committee Member)
Patrick Woodward (Committee Member)
135 p.
Chemistry; Materials Science
organic-based magnets, spintronics

Recommended Citations

Citations

  • Lu, Y. (2015). DEVELOPMENT OF NEW OGANIC-BASED MAGMENTS FOR SPINTRONICS [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440153101

    APA Style (7th edition)

  • Lu, Yu. DEVELOPMENT OF NEW OGANIC-BASED MAGMENTS FOR SPINTRONICS. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1440153101.

    MLA Style (8th edition)

  • Lu, Yu. "DEVELOPMENT OF NEW OGANIC-BASED MAGMENTS FOR SPINTRONICS." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440153101

    Chicago Manual of Style (17th edition)

osu1440153101
438
© 2015, some rights reserved.Creative Commons License DEVELOPMENT OF NEW OGANIC-BASED MAGMENTS FOR SPINTRONICS by Yu Lu is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.