A magnetic head support includes a slider on which a magnetic head is mounted; a suspension that supports the slider; and a pair of piezoelectric actuators that are arranged on sides of the slider other than a side on which the magnetic head is mounted so as to be opposed to each other. The phosphor is a gadolinium-activated strontium magnesium aluminate which preferably has an excitation maximum at about 172 nm. The invention discloses method parameters which lead to the J type aggregation of the chromophores within the channels of the zeolite L crystals.