| abstract |
An object of the present invention is to provide a magnetoresistive element, a magnetic head, a magnetic head assembly, and a magnetic recording device that can easily design a bias point and have high sensitivity and high reliability. SOLUTION: In a magnetoresistive effect element having an oxide or nitride magnetoresistive effect improving layer in a spin valve film, preparation of irradiation with rare gas ion plasma is completely completed as a method of forming the magnetoresistive effect improving layer. By introducing oxygen gas into the oxidation chamber almost at the same time as arranging and irradiating, the controllability when only low oxygen content is exposed is improved, and a high energy assisting effect with rare gas ion or rare gas plasma is provided. Energy oxidation can be realized. |