Magnetometer.md

+<table width="100%" style="text-align:center">
+  <tr>
+    <td>
+Xylophone bar magnetometer
+    </td>
+  </tr>
+  <tr>
+    <td>
+<img src="http://gitlab.onelab.info/getdp/getdp/tree/master/benchmarks/magnetometer/screenshot1.png width="40%">
+    </td>
+    <td>
+<img src="http://gitlab.onelab.info/getdp/getdp/tree/master/benchmarks/magnetometer/screenshot2.png width="40%">
+    </td>
+  </tr>
+  <tr>
+    <td>
+Browse <a href="http://gitlab.onelab.info/getdp/getdp/tree/master/benchmarks/magnetometer/">model files</a>
+    </td>
+  </tr>
+</table>
+
+## Additional information
+
+This is a 3D, multiphysics
+model of a MEMS magnetometer, coupling electromagnetic (electrokinetic),
+mechanichal (elastic) and thermal models. To run the model, open
+`magnetometer.pro` with Gmsh.
+
+When an alternating current flows through it, the magnetometer starts to vibrate
+if it is placed in a magnetic field. The amplitude of the vibration can be used
+to measure the magnetic field. To increase sensitivity, the frequency of the
+current is tuned to excite a resonant mode of the xylophone-type
+structure. Several analyses are predefined: uncoupled modal analysis of the
+structure (`Eigenmodes`) and calculation of the current flow
+(`Electrokinetics`), static and dynamic electro-mechanical analysis
+(`Electro-mechanical`), and coupled electro-thermal analysis
+(`Electro-thermal`).
+
+<table width="100%">
+  <tr>
+    <td>
+Model developed by V. Rochus, I. Niyonzima, @Geuzaine
+    </td>
+  </tr>
+</table>