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I am looking for a system capable of creating a gradient of $100\, \mathrm{K}/\mathrm{\mu \textrm{m}}$ on a $30\, \mathrm{\mu}\textrm{m}$ spacing of a system mounted on a Si-N membrane. My so-called nanoheater is not up to the task.

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Ahh... I was hoping this was a vague informal question. Having recently toured a toroidal fusion reactor, I can tell you where to find a $100K/\mu m$+ temperature gradient! –  NeuroFuzzy Jun 21 '13 at 22:16
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Laser ablation in metals achieves temperatures on the order of 100000K while the skin depth is O(nanometers). I think this adheres to the letter of your question, if not quit the text below. :-)

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