X band (9.369 GHz) EPR/ODMR spectrum of V2 in 4H SiC (black) with an external magnetic field applied perpendicular to the c axis of 4H-SiC, as well as a powder EPR spectrum of (a) nitroxide spin labels (red), (b) gadolinium spin labels (green), and (c) trityl spin labels (pink); left side: without the YIG nanostripe gradient, right: with the YIG nanostripe gradient. Such powder spectrum is expected for spin labels in a frozen solution for example. Blue arrows for probe microwave pulse and dashed dark squarre for pump microwave pulse(s). Short pulses are spectrally broad by Fourier transform. Long pulse are spectrally selective. Multifrequency simultaneous microwave pumping is also now possible with arbitrary waveform generators (AWG).