Information recording and reproducing device

An information recording and reproducing device comprising:

• a first layer;
• a second layer;
• and
• a recording layer provided between the first layer and the second layer and being capable of reversibly changing between a first state having a first resistance and a second state having a second resistance higher than the first resistance by a current supplied via the first layer and the second layer,
• the recording layer including:
• a first compound layer;
• and
• a second compound layer,
• the first compound layer containing a first compound,
• the first compound including a first cation element and a second cation element of a type different from the first cation element, at least one of the first cation element and the second cation element being a transition element having a d-orbital partially filled with electron,
• the second compound layer containing a second compound,
• the second compound including a transition element having a d-orbital partially filled with electron, and the second compound including a void site capable of storing at least one of the first cation element and the second cation element.