I simulated a radio-receiver circuit, where I have actually build a part of the circuit which helps to amplify a AM carrier 550 kHz frequency of microvolts (antenna voltage) into several volts, however, I do not see any amplification on the output voltage as highlighted above. I am not sure what have I done wrong. I have attached my LTspice file at google drive here for edit and just click on download and if possible, edit and simulate it in LTspice to prove that there is amplification.
You need a resistor from the output of D1 to ground for the demodulator to work.
A value of 10k or so is a reasonable starting point.
Th resistor is necessary or the node from the diode will just charge up to the max voltage of the RF then stay there. (It may even have difficulty simulating Spice often doesn't like nodes without a DC path to ground).
C2 is rather large to get a reasonable audio bandwidth - 1000pF would be better.
In your simulation you should couple the voltage generator B1 loosely to the inductor. That loose coupling could be a small capacitor, maybe 10pF.