Spin rotation device

A spin rotation device which is configured to rotate a spin polarized electron beam which is discharged from an electron gun or is discharged from, is reflected on or is made to pass through a sample in the desired direction, the spin rotation device comprising:

• a first condenser lens which focuses the spin polarized electron beam which is discharged from the electron gun or is discharged from or is reflected on the sample;
• a spin rotator which includes a multipole that consists of poles of a multiple of four excluding four, having a point on which the electron beam is focused by the first condenser lens at a lens center or in the vicinity of the lens center and being capable of generating an electric field and a magnetic field;
• a voltage and current generating means which generates a voltage and a current expressed by following formulae which satisfy the Wien condition for rotating spin of the electron beam by a designated angle and making the electron beam advance straightly to the multipole which constitutes the spin rotator;
• and
• a second condenser lens which focuses the electron beam whose spin is rotated by the spin rotator
• V1(n)=V1 Cos(θ0+nθ+α)
• N1(n)=N1 Sin(θ0+nθ+α)
• here, n is the number of the pole, V1(n) and N1(n) are a voltage and a current of an n-th pole, V1 and N1 are a voltage and a current of a uniform field which satisfies the Wien condition, θ0 is an angle of the first pole from the horizontal direction, θ is an angle determined based on the number of poles of the multipole and is obtained as 360° /number of poles, and a indicates the rotating angle of the spin.