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M harberts thesis for submission.pdf (3.4 MB)

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Materials engineering, characterization, and applications of the organic-based magnet, V[TCNE]

Harberts, Megan Marie
http://rave.ohiolink.edu/etdc/view?acc_num=osu1440096659

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Physics.
Organic materials have advantageous properties such as low cost and mechanical flexibility that have made them attractive to complement traditional materials used in electronics and have led to commercial success, especially in organic light emitting diodes (OLEDs). Many rapidly advancing technologies incorporate magnetic materials, leading to the potential for creating analogous organic-based magnetic applications. The semiconducting ferrimagnet, vanadium tetracyanoethylene, V[TCNE]x~2, exhibits room temperature magnetic ordering which makes it an attractive candidate. My research is focused on development of thin films of V[TCNE]x~2 through advancement in growth, materials engineering, and applications. My thesis is broken up into two sections, the first which provides background and details of V[TCNE]x~2 growth and characterization. The second section focuses on advances beyond V[TCNE]x~2 film growth. The ordering of the chapters is for the ease of the reader, but encompasses work that I led and robust collaborations that I have participated in. V[TCNE]x~2 films are deposited through a chemical vapor deposition process (CVD). My advancements to the growth process have led to higher quality films which have higher magnetic ordering temperatures, more magnetically homogenous samples, and extremely narrow ferromagnetic resonance (FMR) linewidths. Beyond improvements in film growth, materials engineering has created new materials and structures with properties to compliment thin film V[TCNE]x~2. Though a robust collaboration with chemistry colleagues, modification of the molecule TCNE has led to the creation of new magnetic materials vanadium methyl tricyanoethylene carboxylate, V[MeTCEC]x and vanadium ethyl tricyanoethylene carboxylate, V[ETCEC]x. Additionally, I have lead a project to deposit V[TCNE]x~2 on periodically patterned substrates leading to the formation of a 1-D array of V[TCNE]x~2 nanowires. These arrays exhibit in-plane magnetic anisotropy, which is not observed in films of V[TCNE]x~2. Additional collaborations have also made significant progress in addressing one of the challenges for incorporating V[TCNE]x~2 into applications, which is the degradation of magnetic properties with exposure to oxygen. By working off of encapsulation technology which has been developed for OLEDs, we have shown that we can use a simple epoxy to extend the magnetic properties of V[TCNE]x~2 films from an order of hours to one month in ambient conditions.
Ezekiel Johnston-Halperin (Advisor)
Jay Gupta (Committee Member)
Annika Peter (Committee Member)
William Putikka (Committee Member)
116 p.
Condensed Matter Physics; Nanoscience; Nanotechnology; Physics
organic magnet; thin film; spintronics; organic nanowires; room temperature magnetism

Recommended Citations

Citations

  • Harberts, M. M. (2015). Materials engineering, characterization, and applications of the organic-based magnet, V[TCNE] [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440096659

    APA Style (7th edition)

  • Harberts, Megan. Materials engineering, characterization, and applications of the organic-based magnet, V[TCNE]. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1440096659.

    MLA Style (8th edition)

  • Harberts, Megan. "Materials engineering, characterization, and applications of the organic-based magnet, V[TCNE]." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1440096659

    Chicago Manual of Style (17th edition)

osu1440096659
893
© 2015, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.