How is giant magnetoresistance utilized in computer memory storage?

In summary, giant magnetoresistance is an effect that allows for the change in conductivity by a magnetic field and works through the manipulation of spin. It is not used in mainstream computer memories, but is utilized in ferromagnetic memories for its ability to sense the state of the storage material. This technology has a long history in computer memory and was even used in the old magnetic core memories. It is desirable for its non-volatile nature, eliminating the need to reboot after a power down.
  • #1
aaaa202
1,169
2
I understand that giant magnetoresistance is the effect that you can change the conductivity by a magnetic field and the basics of how it works in terms of spin etc.
But how is this exactly used to store memory?
 
Engineering news on Phys.org
  • #2
aaaa202 said:
I understand that giant magnetoresistance is the effect that you can change the conductivity by a magnetic field and the basics of how it works in terms of spin etc.
But how is this exactly used to store memory?

It's not. At least in mainstream computer memories. What technology are you asking about? Links?
 
  • #3
It's possible the OP is confusing magnetic recording technology used on hard drives with RAM and ROM internal computer memory.
 
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  • #5
I read the heading at the top of the Wiki reference above. It says
The lead section of this article may need to be rewritten.
which, considering the subject, made me smile.

The history of computer memory and storage technologies makes amazing reading. There have been so many different solutions. Magnetism has been there, periodically, since the beginning.
 
  • #6
he must be talking about the old magnetic core memories used in the 60s
 
  • #7
thankz said:
he must be talking about the old magnetic core memories used in the 60s

Not quite, but the old core store type of memory element was based on the same principle, or so it says in the Wiki article. The non-volatile nature of it makes it very desirable - no need to reboot after a power down.
 

1. What is computer memory?

Computer memory refers to the physical devices and components inside a computer that are responsible for storing and retrieving data. It is where all the instructions and data needed for a computer to function are temporarily stored.

2. How does computer memory work?

Computer memory works by using electrical circuits to store data in the form of 0s and 1s, known as binary code. It allows for quick access to data, as the computer does not have to retrieve information from a slower source, such as a hard drive.

3. What are the different types of computer memory?

There are two main types of computer memory: Primary memory and Secondary memory. Primary memory, also known as RAM, is responsible for temporary storage of data and instructions while the computer is running. Secondary memory, such as hard drives and solid-state drives (SSD), are used for long-term storage of data.

4. How much memory does my computer have?

The amount of memory a computer has can vary depending on the specific model and configuration. Most computers will have at least 4GB of RAM, but high-end computers can have up to 64GB or more. You can check your computer's memory by going to the "System Information" or "About This Mac" section in your computer's settings.

5. Why is computer memory important?

Computer memory is essential for a computer to function properly. Without memory, the computer would not be able to access and process data, which is necessary for running programs and performing tasks. The amount and type of memory a computer has can also impact its performance and speed.

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