The present invention relates to a device for diffractometry df of x-rays or of the neutrons in the single crystals. / p & & p & this device df is characterizes in that the door - sample 8 is carried by a slave goniometer 12 comprising a rod 19 in the transverse ferromagnetic material integral with the door - sample 8, a support 17 on which is mounted for rotation of the door - sample 8 and which forms part of a universal joint 14 mounted on a base 15 is fixed and the means 7 are provided for create a magnetic field h of variable orientation in space of a manner that, for each orientation determined of the magnetic field ferromagnetic the bar 19, and since the door - sample 8 and the single crystal 1 are the same orientation.
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