Master Thesis: Characterization of irreversible processes in valence change memory (VCM) cells on a sub-nanosecond time scale

 The use of bipolar memory devices to achieve synaptic connectivity in neural networks is highly dependent on the ability of the devices to perform analogue conductance modulation using electrical stimuli in the form of identical voltage pulses. Typically, the filamentary components of the valence change memory (VCM) type exhibit abrupt SET switching behaviour and gradual RESET switching behaviour. Therefore, obtaining an analogue modulation of the conductance during SET and RESET is a challenge. In order to achieve analogue writing modes with ultra-short pulses, using a Bias tee, we can simultaneously apply a series of ultra-short pulses (ps) and a continuous read voltage. So one can measure the resistance changes while applying pulse trains. The aim of the thesis is to

• characterize irreversible processes (such as ion migration), investigate analogue modes of operation
  
• realize STP/LTP by gradual stepwise switching events in resistive switching valence change memory (VCM)
  
• track the change of resistance upon application of ultra-short pulses in order to
  
• generate a linear relationship between the change in resistance and the number of pulses
  
• electrical characterization on our ultra-fast RF setup, using bias tee, SMU, pulse generator and oscilloscope
  
• control measurements and evaluate data via python code

Your Profile:

• Master´s student in physics, computer science, electrical engineering, materials science or in a similar field
  
• Basic programming skills (ideally in python)
  
• Interest in experimental and multidisciplinary work
  
• High motivation as well as self-directed learning and working
  
• Proficient English skills; basic German skills are of advantage

Our Offer:

We work on the very latest issues that impact our society and are offering you the chance to actively help in shaping the change! We support you in your work with:

• A world-leading, interdisciplinary and international research environment, provided with state-of-the-art experimental equipment and versatile opportunities to grow as a curious researcher.
  
• Collaborative work environment including researchers at the following institutes: Peter Grünberg Institute - Electronic Materials (PGI-7) and the Institute of Electronic Materials (IWE2) at RWTH Aachen University
  
• An interesting and socially relevant topic for your thesis with future-oriented themes
  
• Ideal conditions for gaining practical experience alongside your studies
  
• Qualified support through your scientific colleagues
  
• The chance to independently prepare and work on your tasks
  
• Flexible work (location) arrangements, e.g. remote work
  
• Flexible working hours as well as a reasonable remuneration
  
• Targeted services for international employees, e.g. through our International Advisory Service
  

The position is initially fixed for 12 months.

Place of employment: Aachen

We welcome applications from people with diverse backgrounds, e.g. in terms of age, gender, disability, sexual orientation / identity, and social, ethnic and religious origin. A diverse and inclusive working environment with equal opportunities in which everyone can realize their potential is important to us.

We look forward to receiving your application. The job will be advertised until the position has been successfully filled. You should therefore submit your application as soon as possible.

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