PhD in Modelling Micromagnetism and Permanent Magnets

A PhD fellowship on studying permanent magnets using amicromagnetism modeling framework is now available at the Department of EnergyConversion and Storage, Technical University of Denmark in collaboration withthe Poul Due Jensen Foundation. 

This PhD position at DTU Energy will constitute one part in aunique research project where we want to model permanent magnets on themicrostructural level to understand why their resistance to opposing magneticfields, their so-called coercivity, is much lower than theoretically predicted.The coercivity is the magnetic field that the permanent magnet can withstandbefore it flips and points in the opposite direction. We will study thisphenomenon by realizing a novel and fast computational model built on anexisting computational framework for magnetic field calculation written inFortran.

For all known permanent magnet materials, the observedcoercivity is at most 40% of the theoretical value. This discrepancy betweenthe theoretical calculation of the coercive magnetic field and the observedcoercive field of permanent magnets is known as Brown’s paradox. In thisproject, we will study this paradox for the most powerful permanent magnetsavailable: NdFeB magnets. The goal of this project is to determine whatphysical mechanism causes Browns paradox. This will be done by realizing a newand much more powerful micromagnetism model by expanding our current mesoscalemodel for magnetism to include the physics needed for a micromagnetism model.Micromagnetic systems are governed by several interplaying physical mechanisms,namely exchange interaction, crystal anisotropy, Zeeman effect and macroscopicdemagnetization. Once Browns paradox has been understood, the following logicalstep will be to propose a mechanism that alleviates the coercivity problem.

Your role as a PhD student will be to expand our magnetismmodel to a full dynamic micromagnetism model together with a post doc in theproject. Once this is done, you will use the model to explore Brown’s paradoxand the mechanisms reducing coercivity in permanent NdFeB magnets. We have a USpartner in the project and as a PhD student you would spend about three to sixmonths there to learn about micromagnetism and coercivity reducing phenomena.

At the end of the PhD project, we will have developed fullyopen source model framework for micromagnetic simulations and have investigatedthe coercivity reducing phenomena and thereby explained Brown’s paradox. Themain activity will take place at the Department of Energy Conversion andStorage at DTU Risø campus initially and from ultimo 2019 at DTU Lyngby campus,as the department is being united at this campus.

Qualifications
Candidates should havea two-year master’s degree (120 ECTS points) or a similar degree with anacademic level equivalent to a two-year master’s degree, preferably in physics,engineering or a science-related discipline. 

Further qualifications:

    Good understanding of numerical modellingGood communication skills in EnglishBeing able to work independently and in a team 

Candidates with the following qualifications are preferred

    Experience with magnetism or electromagnetismExperience with high performance computingExperience with Fortran, Matlab or similar softwareExperience with numerical modelling of temporal systems

Approvaland Enrolment

The scholarship for the PhD degree is subject to academicapproval, and the candidate will be enrolled in one of the general degreeprogrammes at DTU. For information about our enrolment requirements and thegeneral planning of the PhD study programme, please see the DTU PhD Guide.

 

We offer
DTU is a leadingtechnical university globally recognized for the excellence of its research,education, innovation and scientific advice. We offer a rewarding andchallenging job in an international environment. We strive for academicexcellence in an environment characterized by collegial respect and academicfreedom tempered by responsibility.

Salary and appointment terms
The appointment will bebased on the collective agreement with the Danish Confederation of ProfessionalAssociations. The allowance will be agreed upon with the relevant union. 

Theperiod of employment is 3 years.

You can read more about careerpaths at DTU here.

The expected starting date is March 2019 or thereafter.

Further information
Please contact Associate Professor Rasmus Bjørk, rabj@dtu.dkand Associate Professor Kaspar K. Nielsen, kaki@dtu.dk, for further information.

Please do not send applications to this e-mail address,instead apply online as described below.

Application
Please submit your onlineapplication no later than 1 February2019 (local time).

To apply, please openthe link “Apply online”, fill out the online application form. Thefollowing must be attached in English:

    A letter motivating the application (cover letter)Curriculum vitae Grade transcripts and BSc/MSc diplomaExcel sheet with translation of grades to the Danish grading system (see guidelines and Excel spreadsheet here)

All interested candidates irrespective of age, gender, race,disability, religion or ethnic background are encouraged to apply.

DTU Energy is focusingon functional materials and their application in sustainable energy technology.Our research areas include fuel cells, electrolysis, solar cells, magneticrefrigeration, superconductivity and thermoelectrics. Additional informationabout the department can be found on www.ecs.dtu.dk

DTU is a technical university providing internationallyleading research, education, innovation and scientific advice. Ourstaff of 6,000 advance science and technology to create innovative solutionsthat meet the demands of society, and our 11,200 students are being educated toaddress the technological challenges of the future. DTU is an independentacademic university collaborating globally with business, industry, governmentand public agencies.

 
Deadline: 1 February 2019
Unit: DTU Energy
Read the job description and apply online

Post expires on Friday February 1st, 2019