A cartridge memory is a cartridge memory used in a recording medium cartridge and includes an antenna section that induces an induced voltage by means of electromagnetic induction, a load modulation section including a load whose magnitude is variable, and a control section that measures the induced voltage and controls the load modulation section on the basis of the measured induced voltage.

A non-contact communication medium according to one disclosed embodiment includes a memory unit, a power generation unit, a power monitoring unit, and a capacitance control unit. The power generation unit includes a resonant circuit and a rectification circuit, and generates electric power to be supplied to the memory unit. The resonant circuit includes an antenna coil and resonant capacitance unit having a variable capacitance value, and the rectification circuit rectifies a resonant output of the resonant circuit. The power monitoring unit includes a current adjustment element, a reference voltage generation source, and an operational amplifier. The operational amplifier controls the current adjustment element such that an output voltage of the rectification circuit is equal to a reference voltage from the reference voltage generation source. The capacitance control unit is configured to control the resonant capacitance unit on the basis of an output of the operational amplifier.

A noncontact communication medium includes a processor, and a memory incorporated in or connected to the processor, and performs noncontact communication with an external communication device. The memory has a storage block where information determined depending on a specification of a magnetic tape cartridge, in which the noncontact communication medium is mounted, is stored, and the storage block has an identifier storage field. The processor is configured to write an identifier given from the external communication device to the noncontact communication medium, in the identifier storage field, and execute locking processing of locking the identifier storage field in response to a specific command given from the external communication device to the noncontact communication medium.

The magnetic recording medium has an arithmetic average roughness Ra of a surface of a magnetic layer is 2.2 nm or less, a fluorine concentration A obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees being 5 atom % or more and 50 atom % or less, and B, which is calculated by Equation 1 from an integrated intensity Ftotal of fragments derived from a fluorine-containing compound obtained for an entire region in a thickness direction of a cross section of the magnetic layer by line profile analysis of TOF-SIMS and an integrated intensity Fupper of fragments derived from a fluorine compound obtained for a region from the surface of the magnetic layer to an intermediate thickness in the thickness direction of the cross section, being 60% or more and 95% or less, Equation 1:B=(Fupper/Ftotal)×100.

An object is to further improve a thermal stability and an electromagnetic conversion characteristic of a magnetic recording medium.

The present technology provides a magnetic recording medium that includes a layer structure including: a base layer; and a magnetic layer provided on the base layer and including a magnetic powder, in which an average particle volume of the magnetic powder is 2300 nm.sup.3 or less, and a magnetic interaction ΔM calculated by the following expression (1) of the magnetic layer is −0.362≤ΔM≤−0.22,

ΔM={Id(H)+2Ir(H)−Ir(∞)}/Ir(∞)   (1)

[where, in the expression (1), Id(H) is a remanent magnetization measured by a direct-current demagnetization, Ir(H) is a remanent magnetization measured by an alternating-current demagnetization, and Ir(∞) is a remanent magnetization measured by an applied magnetic field of 6 kOe].

A noncontact storage medium that is mounted in a magnetic tape cartridge includes an IC chip that is connected to an antenna to be coupled to a communication destination by electromagnetic induction through a magnetic field applied from a communication destination, and performs communication with the communication destination through the magnetic field, and the IC chip corresponds to a plurality of communication standards.

A noncontact storage medium that is mounted in a magnetic tape cartridge includes an IC chip that is connected to an antenna to be coupled to a communication destination by electromagnetic induction through a magnetic field applied from the communication destination, and performs communication with the communication destination through the magnetic field, and the IC chip corresponds a plurality of communication standards, and performs the communication selectively using the plurality of communication standards.

Provided is a magnetic tape cartridge including: a case in which a magnetic tape is accommodated; and a storage medium provided in the case, in which the storage medium stores tension allowable range related information regarding an allowable range of tension applied to the magnetic tape.

A magnetic tape cartridge includes a case in which a magnetic tape is accommodated and a storage medium provided in the case. At least one of reading or writing of data is performed by a plurality of magnetic elements, which are linearly disposed, with respect to the magnetic tape pulled out from the case. A disposition direction of the plurality of magnetic elements is tilted toward an entire length direction side of the magnetic tape with respect to a width direction of the magnetic tape. The storage medium stores tilt feature information indicating a feature of tilt of the disposition direction with respect to the width direction.

A noncontact communication device includes an antenna, and a processor configured to couple a noncontact storage medium mounted in a magnetic tape cartridge and the antenna by electromagnetic induction to perform communication with the noncontact storage medium. The processor is configured to perform communication in each of a plurality of communication standards, and perform communication with the noncontact storage medium in a communication standard corresponding to the noncontact storage medium among the plurality of communication standards.