Dr Julian Dean

Department of Materials Science and Engineering

Senior Lecturer in Materials Science

j.dean@sheffield.ac.uk
+44 114 222 5473

Sir Robert Hadfield Building

Full contact details

Dr Julian Dean
Department of Materials Science and Engineering
Sir Robert Hadfield Building
Mappin Street
Sheffield
S1 3JD

Profile

Julian Dean obtained his Masters in Physics (MPhys) from the University of Sheffield in 2004. His PhD award in 2007 on micro-electromechanical systems looked at incorporation of magnetostriction in magMEMS. Julian subsequently worked as a Research Associate in the Department of Science and Engineering materials on :-

The simulation of impedance spectroscopy: The analysis of electroceramic materials.
Artificial multiferroic materials
Magnetic micro electromechanical systems (MagMEMS): devices for bio-chemical and security
Magnetic phenomena on the nanoscale
The study of magnetoelasticity at surfaces and interfaces

In 2012 Julian was appointed to the role of University Teacher and then to the role of Lecturer in Materials Simulation in 2013, maintaining his research interests.

Research interests

Functional material responses - design and characterisation
Artificial multiferroic materials
The analysis of electroceramic materials
Magnetic phenomena on the nanoscale
The prediction, optimisation and development of permanent magnetic materials

Key projects:

The development of Impedance Spectroscopy to characterise electroceramics using finite element analysis
The simulation of strain interfaces of functional materials
Realistic microstructure generation for input into finite element simulations
Substitution and Sustainability in Functional Materials and Devices
Magnetic micro electromechanical systems (MagMEMS): devices for bio-chemical and security

Publications

Journal articles

Bates J & Dean JS (2024) A total rip-off—crack propagation in paper. Physics Education, 59(3), 035010-035010.
Ma H, Sinclair DC & Dean JS (2023) A finite element study on the influence of surface cracks on micro-contact impedance spectroscopy measurements. Solid State Ionics, 393, 116173-116173.
Serrazina R, Gomes M, Vilarinho R, Pereira L, Dean JS, Reaney IM, Senos AMOR, Vilarinho PM & Moreira JA (2022) Induced internal stresses and their relation to FLASH sintering of KNN ceramics. Journal of Materials Chemistry C, 10(30), 10916-10925.
Birch SMI, Bates J, Bell M, Christofidou KA, Corkhill CL, Hearnden V, Lopez EA, Mason LC, Southworth A & Dean JS (2021) Bending bad—testing caramel wafer bars (#TestATunnocks). Physics Education, 56(5), 055002-055002.
Li L, Roncal-Herrero T, Harrington J, Milne SJ, Brown AP, Dean JS & Sinclair DC (2021) Anomalous grain boundary conduction in BiScO3-BaTiO3 high temperature dielectrics. Acta Materialia, 117136-117136.
Kerridge G, Sinclair DC & Dean JS (2021) Resource efficient exploration of ternary phase space to develop multi-layer ceramic capacitors. Acta Materialia, 207, 116690-116690.
Serrazina R, Senos AMOR, Pereira L, Dean JS, Reaney IM & Vilarinho PM (2020) Front Cover: The Role of Particle Contact in Densification of FLASH Sintered Potassium Sodium Niobate (Eur. J. Inorg. Chem. 39/2020). European Journal of Inorganic Chemistry, 2020(39), 3708-3708.
Serrazina R, Senos AMOR, Pereira L, Dean JS, Reaney IM & Vilarinho PM (2020) The role of particle contact in densification of FLASH sintered potassium sodium niobate. European Journal of Inorganic Chemistry. View this article in WRRO
Veazey RA, Gandy AS, Sinclair DC & Dean JS (2020) Finite element modeling of resistive surface layers by micro‐contact impedance spectroscopy. Journal of the American Ceramic Society, 103(4), 2702-2714. View this article in WRRO
Serrazina R, Vilarinho PM, Senos AMOR, Pereira L, Reaney IM & Dean JS (2019) Modelling the particle contact influence on the Joule heating and temperature distribution during FLASH sintering. Journal of the European Ceramic Society. View this article in WRRO
Serrazina R, Dean JS, Reaney IM, Pereira L, Vilarinho PM & Senos AM (2019) Mechanism of densification in low-temperature FLASH sintered lead free Potassium Sodium Niobate (KNN) piezoelectrics. Journal of Materials Chemistry C. View this article in WRRO
Heath JP, Harding JH, Sinclair DC & Dean JS (2019) The analysis of impedance spectra for core–shell microstructures : why a multiformalism approach is essential. Advanced Functional Materials, 29(38). View this article in WRRO
Naderi S, Dean JS & Zhang M (2019) Three-dimensional virtual microstructure generation of porous polycrystalline ceramics. Ceramics International. View this article in WRRO
Hamad SF, Farr N, Fei T, Shukor NF, Dean JS, Hayes SA, Foreman JP & Rodenburg C (2019) Optimizing size and distribution of voids in phenolic resins through the choice of catalyst types. Journal of Applied Polymer Science. View this article in WRRO
Kennedy CD, Sinclair DC, Reaney IM & Dean JS (2019) Predicting the energy storage density in poly(methyl methacrylate)/methyl ammonium lead iodide composites. Journal of Applied Physics, 125(21). View this article in WRRO
Faouri SS, Mostaed A, Dean JS, Wang D, Sinclair DC, Zhang S, Whittow WG, Vardaxoglou Y & Reaney IM (2019) High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications. Acta Materialia, 166, 202-207. View this article in WRRO
Mackie AJ, Dean JS & Goodall R (2019) Material and magnetic properties of Sm2(Co, Fe, Cu, Zr)17 permanent magnets processed by Spark Plasma Sintering. Journal of Alloys and Compounds, 770, 765-770. View this article in WRRO
Veazey RA, Gandy A, Sinclair D & Dean J (2018) Modeling the Influence of Two Terminal Electrode Contact Geometry and Sample Dimensions in Electro-materials. Journal of the American Ceramic Society. View this article in WRRO
Grimley ED, Wynn AP, Kelley KP, Sachet E, Dean JS, Freeman CL, Maria J-P & LeBeau JM (2018) Complexities of atomic structure at CdO/MgO and CdO/Al 2O 3 interfaces. Journal of Applied Physics, 124(20). View this article in WRRO
Heath JP, Harding JH, Sinclair DC & Dean JS (2018) Electric field enhancement in ceramic capacitors due to interface amplitude roughness. Journal of the European Ceramic Society. View this article in WRRO
Naderi S, Heath JP & Dean JS (2018) Morphology characterisation of inclusions to predict the breakdown strength in electro-ceramic materials: Microstructure modelling. Ceramics International. View this article in WRRO
Qi J, Cao M, Heath JP, Dean JS, Hao H, Yao Z, Yu Z & Liu H (2018) Improved breakdown strength and energy storage density of a Ce doped strontium titanate core by silica shell coating. Journal of Materials Chemistry C, 6(34), 9130-9139. View this article in WRRO
Atkinson S, Whittle KR, Dean JS & Abram TJ (2018) Prismatic core high temperature reactor fuel modelling incorporating fuel rotation. Nuclear Engineering and Design, 331, 153-161. View this article in WRRO
Dale G, Strawhorne M, Sinclair DC & Dean JS (2018) Finite element modeling on the effect of intra-granular porosity on the dielectric properties of BaTiO₃ MLCCs. Journal of the American Ceramic Society, 101(3), 1211-1220. View this article in WRRO
Morshead FH, Foeller PY, Freeman CL, Zhang H, Reaney IM, Sinclair DC & Dean JS (2017) How to extract reliable core-volume fractions from core-shell polycrystalline microstructures using cross sectional TEM micrographs. Journal of the European Ceramic Society, 37(8), 2795-2801. View this article in WRRO
Foeller PY, Dean JS, Reaney IM & Sinclair DC (2016) Design of a bilayer ceramic capacitor with low temperature coefficient of capacitance. Applied Physics Letters, 109. View this article in WRRO
Johnson C, Bates J, McLaughlin K, Mason S & Dean JS (2016) A sweeter way of teaching health and safety. Physics Education, 51(5), 053006-053006. View this article in WRRO
Mackie AJ, Hatton GD, Hamilton HGC, Dean JS & Goodall R (2016) Carbon uptake and distribution in Spark Plasma Sintering (SPS) processed Sm(Co, Fe, Cu, Zr)z. Materials Letters, 171, 14-17. View this article in WRRO
Dean J, Foeller PY, Reaney I & Sinclair D (2016) A resource efficient design strategy to optimise the temperature coefficient of capacitance of BaTiO3-based ceramics using finite element modelling. Journal of Materials Chemistry A, 4(18), 6896-6901. View this article in WRRO
Dean J, Bryan MT, Cooper JD, Virbule A, Cunningham JE & Hayward TJ (2015) A sound idea: Manipulating domain walls in magnetic nanowires using surface acoustic waves. Applied Physics Letters, 107(14). View this article in WRRO
Heath JP, Dean JS, Harding JH & Sinclair DC (2015) Simulation of Impedance Spectra for Core-Shell Grain Structures Using Finite Element Modeling. Journal of the American Ceramic Society, 98(6), 1925-1931. View this article in WRRO
Dean J & Allwood DA (2014) From compass to hard drive—integrated activities for studying magnets. Physics Education, 49(6), 663-670.
Dean JS, Harding JH & Sinclair DC (2014) Simulation of impedance spectra for a full three-dimensional ceramic microstructure using a finite element model. Journal of the American Ceramic Society, 97(3), 885-891. View this article in WRRO
Dean J, Kohn A, Kovacs A, Allwood DA, Suess D & Schrefl T (2013) Influence of thermal energy on exchange-bias studied by finite-element simulations. APPLIED PHYSICS LETTERS, 103(4).
Dean J, Thomson K, Hollands L, Bates J, Carter M, Freeman C, Kapranos P & Goodall R (2013) High-performance composite chocolate. Physics Education, 48(4), 465-471.
Bryan MT, Dean J & Allwood DA (2012) Dynamics of stress-induced domain wall motion. PHYSICAL REVIEW B, 85(14).
Bryan MT, Bance S, Dean J, Schrefl T & Allwood DA (2012) Transverse and vortex domain wall structure in magnetic nanowires with uniaxial in-plane anisotropy.. J Phys Condens Matter, 24(2), 024205. View this article in WRRO
Bashir MA, Schrefl T, Dean J, Goncharov A, Hrkac G, Allwood DA & Suess D (2012) Head and bit patterned media optimization at areal densities of 2.5 Tbit/in² and beyond. Journal of Magnetism and Magnetic Materials, 324(3), 269-275.
Dean J, Kohn A, Kovacs A, Zeltser A, Carey MJ, Hrkac G, Allwood DA & Schrefl T (2011) The formation mechanism of 360 degrees domain walls in exchange-biased polycrystalline ferromagnetic films. J APPL PHYS, 110(7).
Dean J, Bryan MT, Morley NA, Hrkac G, Javed A, Gibbs MRJ & Allwood DA (2011) Numerical study of the effective magnetocrystalline anisotropy and magnetostriction in polycrystalline FeGa films. J APPL PHYS, 110(4).
Hrkac G, Dean J & Allwood DA (2011) Nanowire spintronics for storage class memories and logic.. Philos Trans A Math Phys Eng Sci, 369(1948), 3214-3228.
Kohn A, Dean J, Kovacs A, Zeltser A, Carey MJ, Geiger D, Hrkac G, Schrefl T & Allwood D (2011) Exchange-bias in amorphous ferromagnetic and polycrystalline antiferromagnetic bilayers: Structural study and micromagnetic modeling. J APPL PHYS, 109(8).
Dean J, Bryan MT, Schrefl T & Allwood DA (2011) Stress-based control of magnetic nanowire domain walls in artificial multiferroic systems. Journal of Applied Physics, 109(2).
Dean J, Bryan MT, Hrkac G, Goncharov A, Freeman CL, Bashir MA, Schrefl T & Allwood DA (2010) The incorporation of the Cauchy stress matrix tensor in micromagnetic simulations. J APPL PHYS, 108(7).
Hrkac G, Goncharov A, Dean J, Schrefl T, Kim JV, Devolder T, Chappert C, Cornelissen S, van Roy W & Lagae L (2010) Influence of oscillation modes on the line width of rf emissions in MgO based nanopillars. J MOL CATAL A-CHEM, 328(1-2).
Kohn A, Kovacs A, Wang S-G, Wang C, Dean J, Schrefl T, Zeltser A, Carey MJ, Petford-Long AK & C Ward RC (2010) Comparison of Exchange-Bias Using Epitaxial and Polycrystalline Ir0.2Mn0.8 Antiferromagnetic Thin Films: a TEM and Lorentz TEM Study. Microscopy and Microanalysis, 16(S2), 1914-1915.
Bryan MT, Dean J, Schrefl T, Thompson FE, Haycock JW & Allwood DA (2010) The effect of trapping superparamagnetic beads on domain wall motion (vol 96, 192503, 2010). APPL PHYS LETT, 96(23).
Bryan MT, Dean J, Schrefl T, Thompson FE, Haycock J & Allwood DA (2010) The effect of trapping superparamagnetic beads on domain wall motion. APPL PHYS LETT, 96(19). View this article in WRRO
Goncharov AV, Hrkac G, Dean JS & Schrefl T (2010) Kronecker product approximation of demagnetizing tensors for micromagnetics. J COMPUT PHYS, 229(7), 2544-2549.
Dean J, Kovacs A, Kohn A, Goncharov A, Bashir MA, Hrkac G, Allwood DA & Schrefl T (2010) Exchange bias interactions in polycrystalline/amorphous bilayers. APPL PHYS LETT, 96(7).
Hrkac G, Woodcock TG, Freeman C, Goncharov A, Dean J, Schrefl T & Gutfleisch O (2010) The role of local anisotropy profiles at grain boundaries on the coercivity of Nd2Fe14B magnets. Applied Physics Letters, 97(23).
Bashir MA, Schrefl T, Dean J, Goncharov A, Hrkac G, Allwood DA & Suess D (2010) Head and bit patterned media optimization at areal densities of 2.5 Tbit/in2 and beyond. Journal of Magnetism and Magnetic Materials.
Lee J, Suess D, Schrefl T, Dean J & Fidler J (2009) Increases in effective head field gradients in exchange spring media. APPL PHYS LETT, 95(17).
Dean JS, Bryan MT, Allwood DA, Bance S, Bashir MA, Hrkac G, Goncharov A & Schrefl T (2009) Tailoring Domain-Wall Dynamics With Uniaxial Anisotropy in Nanowires. IEEE TRANSACTIONS ON MAGNETICS, 45(10), 4067-4069.
Bashir MA, Schrefl T, Suess D, Dean J, Goncharov A, Hrkac G, Bance S, Allwood DA & Fidler J (2009) Exchange Coupled Bit Patterned Media Under the Influence of RF-Field Pulses. IEEE TRANSACTIONS ON MAGNETICS, 45(10), 3851-3854.
Baker A, Billard M, Brown K, Goadsby A, Green S, Howard C, Kodippili S, Newton A, Ning X, Stead M , Vallance L et al (2009) A study of hard:soft layer ratios and angular switching in exchange coupled media. J APPL PHYS, 106(5).
Winkler G, Suess D, Lee J, Fidler J, Bashir MA, Dean J, Goncharov A, Hrkac G, Bance S & Schrefl T (2009) Microwave-assisted three-dimensional multilayer magnetic recording. APPL PHYS LETT, 94(23).
Hrkac G, Schrefl T, Dean J, Goncharov A, Bance S, Allwood D, Suess D & Fidler J (2009) Micromagnetics of single and double point contact spin torque oscillators. J APPL PHYS, 105(8).
Hrkac G, Schrefl T, Dean J, Goncharov A, Bance S, Suess D & Fidler J (2009) Internal effective field sources for spin torque nanopillar oscillators. J APPL PHYS, 105(5).
Allwood DA, Dean J, Bryan MT & Baker A (2009) Bringing science research into secondary schools. Physics Education, 44(6), 627-632.
Hrkac G, Schrefl T, Bance S, Allwood D, Goncharov A, Dean J & Suess D (2008) Mutual phase locking in high-frequency microwave nano-oscillators as a function of field angle. J MAGN MAGN MATER, 320(17), L111-L115.
Dean J, Bashir MA, Goncharov A, Hrkac G, Bance S, Schrefl T, Cazacu A, Gubbins M, Lamberton RW & Suess D (2008) Thermally induced adjacent track erasure in exchange spring media. APPL PHYS LETT, 92(14).
Bance S, Schrefl T, Hrkac G, Goncharov A, Allwood DA & Dean J (2008) Micromagnetic calculation of spin wave propagation for magnetologic devices. JOURNAL OF APPLIED PHYSICS, 103(7).
Goncharov A, Schrefl T, Hrkac G, Dean J, Bance S, Suess D, Ertl O, Dorfbauer F & Fidler J (2007) Recording simulations on graded media for area densities of up to 1 Tbit/in.(2). APPL PHYS LETT, 91(22).
Dean J, Gibbs MRJ & Schrefl T (2006) Finite-element analysis on cantilever beams coated with magnetostrictive material. IEEE T MAGN, 42(2), 283-288. View this article in WRRO
Dean JS & Gibbs MR (2006) Finite element modelling of a magnetostrictive coated cantilever system as a function of magnetic film thickness. INTERMAG 2006 - IEEE International Magnetics Conference, 598.
Ward RE, Freeman CL, Dean JS, Sinclair DC & Harding JH () Using metadynamics to obtain the free energy landscape for cation diffusion in functional ceramics : dopant distribution control in rare earth-doped BaTiO3. Advanced Functional Materials. View this article in WRRO
Yang F, Dean JS, Hu Q, Wu P, Pradal-Velázquez E, Li L & Sinclair DC () From insulator to oxide-ion conductor by a synergistic effect from defect chemistry and microstructure: acceptor-doped Bi-excess sodium bismuth titanate Na0.5Bi0.51TiO3.015. Journal of Materials Chemistry A.

Conference proceedings papers

Kennedy CD, Reaney IM & Dean JS (2018) Finite element study of the effect of particle interaction on the energy storage density of composite dielectrics. Energy Procedia, Vol. 151 (pp 129-134), 11 September 2018 - 12 September 2018. View this article in WRRO
Kovacs A, Kohn A, Dean J, Schrefl T, Zeltser A & Carey MJ (2009) Reversal Mechanism of Exchange-Biased CoFeB/IrMn Bilayers Observed by Lorentz Electron Microscopy. IEEE TRANSACTIONS ON MAGNETICS, Vol. 45(10) (pp 3873-3876)
Bashir MA, Schrefl T, Dean J, Goncharov A, Hrkac G, Bance S, Allwood D & Suess D (2008) Microwave-Assisted Magnetization Reversal in Exchange Spring Media. IEEE TRANSACTIONS ON MAGNETICS, Vol. 44(11) (pp 3519-3522)
Schrefl T, Hrkac G, Goncharov A, Dean J, Bance S, Bashir MA & Suess D (2008) Finite element/boundary element simulation of future hard disk recording. COMPUTATIONAL METHODS AND APPLIED COMPUTING (pp 430-435)

Preprints

Goncharov A, Hrkac G, Dean J & Schrefl T (2012) Finite Element Modelling of Impedance Spectroscopy Data in Composite Electroceramics.

Teaching activities

Julian is actively involved in public outreach and education, particularly with school age students. Working with Dr Dan Allwood and Dr Matthew Bryan, he assisted local Sixth Form students in conducting research on designing new magnetic hard drive materials. This work resulted in a research paper [J. Appl. Phys. 106, (2009) 053902] and an education paper on the project itself [Phys. Ed. 44 (2009) 627]. Julian was also co-awarded the 2009 Kroto Prize for Excellence in the Science Education of Young People.

He has run hands-on Materials outreach activities for school students from 5 – 18. These sessions include ‘High-performance composite chocolate’ (Ages 5-21) [Phys. Ed 48 2013] , ‘Magnets’ (Ages 7-11) and ‘Structural materials properties’ (Ages 14-18). Most recently worked with Dr Dan Allwood to develop a suite of Flash-based virtual experiments to support Physics A-level tuition: FlashyScience. These have been used to deliver lessons to A-level (16-18 years) students and are used as part of graduate programmes.