Method of manufacturing a thermoelectric conversion element and its use

An object of the present invention is to provide a good and at the same time showing a thermoelectric conversion performance, flexibility having, or uneven or curved surfaces to be implemented thermoelectric conversion element and its manufacturing method its use. The thermoelectric conversion element of the present invention includes a columnar crystal ferrite layer, wherein formed on the columnar crystal ferrite layer, and a photovoltaic film configured to generate an electromotive force in the plane direction by the inverse spin Hall a thermoelectric conversion element, the long axis a of the columnar crystal grains of columnar crystal ferrite layer is 200nm or more, the short axis b is in 500nm or less, and a> b. (Fig. 1)